diff --git a/.eslintrc.js b/.eslintrc.js
index c8663998..a8731c42 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -43,5 +43,11 @@
         // This rule actual for user input data on the node.js environment mainly.
         "security/detect-object-injection": 0,
         "indent": ["warn", 4],
+        // recently added to airbnb
+        "max-classes-per-file": [0],
+        // it was opposite before and our code has been written according to previous rule
+        "arrow-parens": [0],
+        // object spread is a modern ECMA standard. Let's do not use it without babel
+        "prefer-object-spread": [0],
     },
 };
diff --git a/cvat-core/src/session.js b/cvat-core/src/session.js
index ae70c5f2..e985b5e4 100644
--- a/cvat-core/src/session.js
+++ b/cvat-core/src/session.js
@@ -1307,22 +1307,22 @@
             z_order: Boolean(this.zOrder),
         };
 
-        if (this.bugTracker) {
+        if (typeof (this.bugTracker) !== 'undefined') {
             taskData.bug_tracker = this.bugTracker;
         }
-        if (this.segmentSize) {
+        if (typeof (this.segmentSize) !== 'undefined') {
             taskData.segment_size = this.segmentSize;
         }
-        if (this.overlap) {
+        if (typeof (this.overlap) !== 'undefined') {
             taskData.overlap = this.overlap;
         }
-        if (this.startFrame) {
+        if (typeof (this.startFrame) !== 'undefined') {
             taskData.start_frame = this.startFrame;
         }
-        if (this.stopFrame) {
+        if (typeof (this.stopFrame) !== 'undefined') {
             taskData.stop_frame = this.stopFrame;
         }
-        if (this.frameFilter) {
+        if (typeof (this.frameFilter) !== 'undefined') {
             taskData.frame_filter = this.frameFilter;
         }
 
diff --git a/cvat/apps/dashboard/static/dashboard/js/dashboard.js b/cvat/apps/dashboard/static/dashboard/js/dashboard.js
index f5fbc8f2..6d887eb7 100644
--- a/cvat/apps/dashboard/static/dashboard/js/dashboard.js
+++ b/cvat/apps/dashboard/static/dashboard/js/dashboard.js
@@ -240,9 +240,16 @@ class DashboardView {
 
                 let tasks = null;
                 try {
-                    tasks = await window.cvat.tasks.get(Object.assign({}, {
+                    const id = (new URLSearchParams(window.location.search)).get('id');
+                    const filters = Object.assign({}, {
                         page,
-                    }, this._params));
+                    }, this._params);
+
+                    if (id !== null) {
+                        filters.id = +id;
+                    }
+
+                    tasks = await window.cvat.tasks.get(filters);
                 } catch (exception) {
                     let { message } = exception;
                     if (exception instanceof window.cvat.exceptions.ServerError) {
@@ -316,6 +323,8 @@ class DashboardView {
                 this._params.search = search;
             }
 
+            window.history.replaceState(null, null,
+                `${window.location.origin}${window.location.pathname}`);
             dashboardPagination.twbsPagination('show', 1);
         });
 
diff --git a/cvat/apps/engine/annotation.py b/cvat/apps/engine/annotation.py
index 13d42c34..fb152076 100644
--- a/cvat/apps/engine/annotation.py
+++ b/cvat/apps/engine/annotation.py
@@ -650,7 +650,9 @@ class TaskAnnotation:
     def __init__(self, pk, user):
         self.user = user
         self.db_task = models.Task.objects.prefetch_related("image_set").get(id=pk)
-        self.db_jobs = models.Job.objects.select_related("segment").filter(segment__task_id=pk)
+
+        # Postgres doesn't guarantee an order by default without explicit order_by
+        self.db_jobs = models.Job.objects.select_related("segment").filter(segment__task_id=pk).order_by('id')
         self.ir_data = AnnotationIR()
 
     def reset(self):
diff --git a/cvat/apps/engine/migrations/0021_auto_20190826_1827.py b/cvat/apps/engine/migrations/0021_auto_20190826_1827.py
new file mode 100644
index 00000000..72600522
--- /dev/null
+++ b/cvat/apps/engine/migrations/0021_auto_20190826_1827.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.4 on 2019-08-26 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('engine', '0020_remove_task_flipped'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='task',
+            name='frame_filter',
+            field=models.CharField(blank=True, default='', max_length=256),
+        ),
+    ]
diff --git a/cvat/apps/engine/models.py b/cvat/apps/engine/models.py
index a56b6351..d41000ad 100644
--- a/cvat/apps/engine/models.py
+++ b/cvat/apps/engine/models.py
@@ -51,7 +51,7 @@ class Task(models.Model):
     image_quality = models.PositiveSmallIntegerField(default=50)
     start_frame = models.PositiveIntegerField(default=0)
     stop_frame = models.PositiveIntegerField(default=0)
-    frame_filter = models.CharField(max_length=256, default="")
+    frame_filter = models.CharField(max_length=256, default="", blank=True)
     status = models.CharField(max_length=32, choices=StatusChoice.choices(),
         default=StatusChoice.ANNOTATION)
 
diff --git a/cvat/apps/engine/static/engine/js/cvat-core.min.js b/cvat/apps/engine/static/engine/js/cvat-core.min.js
index 8dc7fe2d..4e810852 100644
--- a/cvat/apps/engine/static/engine/js/cvat-core.min.js
+++ b/cvat/apps/engine/static/engine/js/cvat-core.min.js
@@ -1,15 +1,15 @@
-window.cvat=function(t){var e={};function n(r){if(e[r])return e[r].exports;var o=e[r]={i:r,l:!1,exports:{}};return t[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}return n.m=t,n.c=e,n.d=function(t,e,r){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:r})},n.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in t)n.d(r,o,function(e){return t[e]}.bind(null,o));return r},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,"a",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p="",n(n.s=90)}([function(t,e,n){(function(e){var n="object",r=function(t){return 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data(t=(()=>{})){return await r.apiWrapper.call(this,l.prototype.data,t)}}l.prototype.data.implementation=async function(t){return new Promise(async(n,r)=>{try{if(this.number in u[this.tid])n(u[this.tid][this.number]);else{t();const r=await o.frames.getData(this.tid,this.number);if(a)u[this.tid][this.number]=e.Buffer.from(r,"binary").toString("base64"),n(u[this.tid][this.number]);else if(s){const t=new FileReader;t.onload=()=>{u[this.tid][this.number]=t.result,n(u[this.tid][this.number])},t.readAsDataURL(r)}}}catch(t){r(t)}})},t.exports={FrameData:l,getFrame:async function(t,e,n){if(t in c||(c[t]={},c[t].meta=await o.frames.getMeta(t),u[t]={}),!(n in c[t])){let r=null;if("interpolation"===e)[r]=c[t].meta;else{if("annotation"!==e)throw new i(`Invalid mode is specified ${e}`);if(n>=c[t].meta.length)throw new i(`Meta information about frame ${n} can't be received from the server`);r=c[t].meta[n]}c[t][n]=new l(r.width,r.height,t,n)}return 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It was ignored."),null}t.exports=class{constructor(t){this.startFrame=t.startFrame,this.stopFrame=t.stopFrame,this.frameMeta=t.frameMeta,this.labels=t.labels.reduce((t,e)=>(t[e.id]=e,t),{}),this.shapes={},this.tags={},this.tracks=[],this.objects={},this.count=0,this.flush=!1,this.collectionZ={},this.groups={max:0},this.injection={labels:this.labels,collectionZ:this.collectionZ,groups:this.groups,frameMeta:this.frameMeta}}import(t){for(const e of t.tags){const t=++this.count,n=new f(e,t,this.injection);this.tags[n.frame]=this.tags[n.frame]||[],this.tags[n.frame].push(n),this.objects[t]=n}for(const e of t.shapes){const t=++this.count,n=k(e,t,this.injection);this.shapes[n.frame]=this.shapes[n.frame]||[],this.shapes[n.frame].push(n),this.objects[t]=n}for(const e of t.tracks){const t=++this.count,n=S(e,t,this.injection);n&&(this.tracks.push(n),this.objects[t]=n)}return this}export(){return{tracks:this.tracks.filter(t=>!t.removed).map(t=>t.toJSON()),shapes:Object.values(this.shapes).reduce((t,e)=>(t.push(...e),t),[]).filter(t=>!t.removed).map(t=>t.toJSON()),tags:Object.values(this.tags).reduce((t,e)=>(t.push(...e),t),[]).filter(t=>!t.removed).map(t=>t.toJSON())}}get(t){const{tracks:e}=this,n=this.shapes[t]||[],r=this.tags[t]||[],o=e.concat(n).concat(r).filter(t=>!t.removed),i=[];for(const e of o){const n=e.get(t);if(n.outside&&!n.keyframe)continue;const r=h.call(e,t,n);i.push(r)}return i}merge(t){if(d("shapes for merge",t,null,Array),!t.length)return;const e=t.map(t=>{d("object state",t,null,x);const e=this.objects[t.clientID];if(void 0===e)throw new y("The object has not been saved yet. Call ObjectState.put([state]) before you can merge it");return e}),n={},{label:r,shapeType:o}=t[0];if(!(r.id in this.labels))throw new y(`Unknown label for the task: ${r.id}`);if(!Object.values(w).includes(o))throw new y(`Got unknown shapeType "${o}"`);const i=r.attributes.reduce((t,e)=>(t[e.id]=e,t),{});for(let s=0;s<e.length;s++){const a=e[s],c=t[s];if(c.label.id!==r.id)throw new y(`All shape labels are expected to be ${r.name}, but got ${c.label.name}`);if(c.shapeType!==o)throw new y(`All shapes are expected to be ${o}, but got ${c.shapeType}`);if(a instanceof p){if(a.frame in n&&!n[a.frame].outside)throw new y("Expected only one visible shape per frame");n[a.frame]={type:o,frame:a.frame,points:[...a.points],occluded:a.occluded,zOrder:a.zOrder,outside:!1,attributes:Object.keys(a.attributes).reduce((t,e)=>(e in i&&i[e].mutable&&t.push({spec_id:+e,value:a.attributes[e]}),t),[])},a.frame+1 in n||(n[a.frame+1]=JSON.parse(JSON.stringify(n[a.frame])),n[a.frame+1].outside=!0,n[a.frame+1].frame++)}else{if(!(a instanceof l))throw new y(`Trying to merge unknown object type: ${a.constructor.name}. `+"Only shapes and tracks are expected.");{const t={};for(const e of Object.keys(a.shapes)){const r=a.shapes[e];if(e in n&&!n[e].outside){if(r.outside)continue;throw new y("Expected only one visible shape per frame")}let i=!1;for(const e in r.attributes)e in t&&t[e]===r.attributes[e]||(i=!0,t[e]=r.attributes[e]);n[e]={type:o,frame:+e,points:[...r.points],occluded:r.occluded,outside:r.outside,zOrder:r.zOrder,attributes:i?Object.keys(t).reduce((e,n)=>(e.push({spec_id:+n,value:t[n]}),e),[]):[]}}}}}let s=!1;for(const t of Object.keys(n).sort((t,e)=>+t-+e)){if((s=s||n[t].outside)||!n[t].outside)break;delete n[t]}const a=++this.count,c=S({frame:Math.min.apply(null,Object.keys(n).map(t=>+t)),shapes:Object.values(n),group:0,label_id:r.id,attributes:Object.keys(t[0].attributes).reduce((e,n)=>(i[n].mutable||e.push({spec_id:+n,value:t[0].attributes[n]}),e),[])},a,this.injection);this.tracks.push(c),this.objects[a]=c;for(const t of e)t.removed=!0,"function"==typeof t.resetCache&&t.resetCache()}split(t,e){d("object state",t,null,x),d("frame",e,"integer",null);const n=this.objects[t.clientID];if(void 0===n)throw new y("The object has not been saved yet. Call annotations.put([state]) before");if(t.objectType!==O.TRACK)return;const r=Object.keys(n.shapes).sort((t,e)=>+t-+e);if(e<=+r[0]||e>r[r.length-1])return;const o=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{}),i=n.toJSON(),s={type:t.shapeType,points:[...t.points],occluded:t.occluded,outside:t.outside,zOrder:0,attributes:Object.keys(t.attributes).reduce((e,n)=>(o[n].mutable||e.push({spec_id:+n,value:t.attributes[n]}),e),[]),frame:e},a={frame:i.frame,group:0,label_id:i.label_id,attributes:i.attributes,shapes:[]},c=JSON.parse(JSON.stringify(a));c.frame=e,c.shapes.push(JSON.parse(JSON.stringify(s))),i.shapes.map(t=>(delete t.id,t.frame<e?a.shapes.push(JSON.parse(JSON.stringify(t))):t.frame>e&&c.shapes.push(JSON.parse(JSON.stringify(t))),t)),a.shapes.push(s),a.shapes[a.shapes.length-1].outside=!0;let u=++this.count;const l=S(a,u,this.injection);this.tracks.push(l),this.objects[u]=l,u=++this.count;const p=S(c,u,this.injection);this.tracks.push(p),this.objects[u]=p,n.removed=!0,n.resetCache()}group(t,e){d("shapes for group",t,null,Array);const n=t.map(t=>{d("object state",t,null,x);const e=this.objects[t.clientID];if(void 0===e)throw new y("The object has not been saved yet. Call annotations.put([state]) before");return e}),r=e?0:++this.groups.max;for(const t of n)t.group=r,"function"==typeof t.resetCache&&t.resetCache();return r}clear(){this.shapes={},this.tags={},this.tracks=[],this.objects={},this.count=0,this.flush=!0}statistics(){const t={},e={rectangle:{shape:0,track:0},polygon:{shape:0,track:0},polyline:{shape:0,track:0},points:{shape:0,track:0},tags:0,manually:0,interpolated:0,total:0},n=JSON.parse(JSON.stringify(e));for(const n of Object.values(this.labels)){const{name:r}=n;t[r]=JSON.parse(JSON.stringify(e))}for(const e of Object.values(this.objects)){let n=null;if(e instanceof p)n="shape";else if(e instanceof l)n="track";else{if(!(e instanceof f))throw new v(`Unexpected object type: "${n}"`);n="tag"}const r=e.label.name;if("tag"===n)t[r].tags++,t[r].manually++,t[r].total++;else{const{shapeType:o}=e;if(t[r][o][n]++,"track"===n){const n=Object.keys(e.shapes).sort((t,e)=>+t-+e).map(t=>+t);let o=n[0],i=!1;for(const s of n){if(i){const e=s-o-1;t[r].interpolated+=e,t[r].total+=e}i=!e.shapes[s].outside,o=s,i&&(t[r].manually++,t[r].total++)}const s=n[n.length-1];if(s!==this.stopFrame&&!e.shapes[s].outside){const e=this.stopFrame-s;t[r].interpolated+=e,t[r].total+=e}}else t[r].manually++,t[r].total++}}for(const e of Object.keys(t))for(const r of Object.keys(t[e]))if("object"==typeof t[e][r])for(const o of Object.keys(t[e][r]))n[r][o]+=t[e][r][o];else n[r]+=t[e][r];return new b(t,n)}put(t){d("shapes for put",t,null,Array);const e={shapes:[],tracks:[],tags:[]};function n(t,e){const n=+e,r=this.attributes[e];return d("attribute id",n,"integer",null),d("attribute value",r,"string",null),t.push({spec_id:n,value:r}),t}for(const r of t){d("object state",r,null,x),d("state client ID",r.clientID,"undefined",null),d("state frame",r.frame,"integer",null),d("state attributes",r.attributes,null,Object),d("state label",r.label,null,g);const t=Object.keys(r.attributes).reduce(n.bind(r),[]),o=r.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});if("tag"===r.objectType)e.tags.push({attributes:t,frame:r.frame,label_id:r.label.id,group:0});else{d("state occluded",r.occluded,"boolean",null),d("state points",r.points,null,Array);for(const t of r.points)d("point coordinate",t,"number",null);if(!Object.values(w).includes(r.shapeType))throw new y("Object shape must be one of: "+`${JSON.stringify(Object.values(w))}`);if("shape"===r.objectType)e.shapes.push({attributes:t,frame:r.frame,group:0,label_id:r.label.id,occluded:r.occluded||!1,points:[...r.points],type:r.shapeType,z_order:0});else{if("track"!==r.objectType)throw new y("Object type must be one of: "+`${JSON.stringify(Object.values(O))}`);e.tracks.push({attributes:t.filter(t=>!o[t.spec_id].mutable),frame:r.frame,group:0,label_id:r.label.id,shapes:[{attributes:t.filter(t=>o[t.spec_id].mutable),frame:r.frame,occluded:r.occluded||!1,outside:!1,points:[...r.points],type:r.shapeType,z_order:0}]})}}}this.import(e)}select(t,e,n){d("shapes for select",t,null,Array),d("x coordinate",e,"number",null),d("y coordinate",n,"number",null);let r=null,o=null;for(const i of t){if(d("object state",i,null,x),i.outside)continue;const t=this.objects[i.clientID];if(void 0===t)throw new y("The object has not been saved yet. Call annotations.put([state]) before");const s=t.constructor.distance(i.points,e,n);null!==s&&(null===r||s<r)&&(r=s,o=i)}return{state:o,distance:r}}}})()},function(t,e,n){"use strict";var r=n(2);t.exports=function(t,e){var n=[][t];return!n||!r(function(){n.call(null,e||function(){throw 1},1)})}},function(t,e,n){n(4),n(87),n(8),(()=>{const e=n(51),{checkObjectType:r}=n(39),{ObjectShape:o,ObjectType:i,AttributeType:s}=n(20),{DataError:a,ArgumentError:c,ScriptingError:u}=n(5),{Label:l}=n(38);function p(t,n){const r=new e(n);return r.hidden={save:this.save.bind(this,t,r),delete:this.delete.bind(this),up:this.up.bind(this,t,r),down:this.down.bind(this,t,r)},r}function f(t,e){if(t===o.RECTANGLE){if(e.length/2!=2)throw new a(`Rectangle must have 2 points, but got ${e.length/2}`)}else if(t===o.POLYGON){if(e.length/2<3)throw new a(`Polygon must have at least 3 points, but got ${e.length/2}`)}else if(t===o.POLYLINE){if(e.length/2<2)throw new a(`Polyline must have at least 2 points, but got ${e.length/2}`)}else{if(t!==o.POINTS)throw new c(`Unknown value of shapeType has been recieved ${t}`);if(e.length/2<1)throw new a(`Points must have at least 1 points, but got ${e.length/2}`)}}function h(t,e){if(t===o.POINTS)return!0;let n=Number.MAX_SAFE_INTEGER,r=Number.MIN_SAFE_INTEGER,i=Number.MAX_SAFE_INTEGER,s=Number.MIN_SAFE_INTEGER;for(let t=0;t<e.length-1;t+=2)n=Math.min(n,e[t]),r=Math.max(r,e[t]),i=Math.min(i,e[t+1]),s=Math.max(s,e[t+1]);if(t===o.POLYLINE){return Math.max(r-n,s-i)>=3}return(r-n)*(s-i)>=9}function d(t,e){const{values:n}=e,r=e.inputType;if("string"!=typeof t)throw new c(`Attribute value is expected to be string, but got ${typeof t}`);return r===s.NUMBER?+t>=+n[0]&&+t<=+n[1]&&!((+t-+n[0])%+n[2]):r===s.CHECKBOX?["true","false"].includes(t.toLowerCase()):n.includes(t)}class b{constructor(t,e,n){this.taskLabels=n.labels,this.clientID=e,this.serverID=t.id,this.group=t.group,this.label=this.taskLabels[t.label_id],this.frame=t.frame,this.removed=!1,this.lock=!1,this.attributes=t.attributes.reduce((t,e)=>(t[e.spec_id]=e.value,t),{}),this.appendDefaultAttributes(this.label),n.groups.max=Math.max(n.groups.max,this.group)}appendDefaultAttributes(t){const e=t.attributes;for(const t of e)t.id in this.attributes||(this.attributes[t.id]=t.defaultValue)}delete(t){return this.lock&&!t||(this.removed=!0),!0}}class g extends b{constructor(t,e,n,r){super(t,e,r),this.frameMeta=r.frameMeta,this.collectionZ=r.collectionZ,this.color=n,this.shapeType=null}_getZ(t){return this.collectionZ[t]=this.collectionZ[t]||{max:0,min:0},this.collectionZ[t]}save(){throw new u("Is not implemented")}get(){throw new u("Is not implemented")}toJSON(){throw new u("Is not implemented")}up(t,e){const n=this._getZ(t);n.max++,e.zOrder=n.max}down(t,e){const n=this._getZ(t);n.min--,e.zOrder=n.min}}class m extends g{constructor(t,e,n,r){super(t,e,n,r),this.points=t.points,this.occluded=t.occluded,this.zOrder=t.z_order;const o=this._getZ(this.frame);o.max=Math.max(o.max,this.zOrder||0),o.min=Math.min(o.min,this.zOrder||0)}toJSON(){return{type:this.shapeType,clientID:this.clientID,occluded:this.occluded,z_order:this.zOrder,points:[...this.points],attributes:Object.keys(this.attributes).reduce((t,e)=>(t.push({spec_id:e,value:this.attributes[e]}),t),[]),id:this.serverID,frame:this.frame,label_id:this.label.id,group:this.group}}get(t){if(t!==this.frame)throw new u("Got frame is not equal to the frame of the shape");return{objectType:i.SHAPE,shapeType:this.shapeType,clientID:this.clientID,serverID:this.serverID,occluded:this.occluded,lock:this.lock,zOrder:this.zOrder,points:[...this.points],attributes:Object.assign({},this.attributes),label:this.label,group:this.group,color:this.color}}save(t,e){if(t!==this.frame)throw new u("Got frame is not equal to the frame of the shape");if(this.lock&&e.lock)return p.call(this,t,this.get(t));const n=this.get(t),o=e.updateFlags;if(o.label&&(r("label",e.label,null,l),n.label=e.label,n.attributes={},this.appendDefaultAttributes.call(n,n.label)),o.attributes){const t=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});for(const r of Object.keys(e.attributes)){const o=e.attributes[r];if(!(r in t&&d(o,t[r])))throw new c(`Trying to save unknown attribute with id ${r} and value ${o}`);n.attributes[r]=o}}if(o.points){r("points",e.points,null,Array),f(this.shapeType,e.points);const{width:o,height:i}=this.frameMeta[t],s=[];for(let t=0;t<e.points.length-1;t+=2){const n=e.points[t],a=e.points[t+1];r("coordinate",n,"number",null),r("coordinate",a,"number",null),s.push(Math.clamp(n,0,o),Math.clamp(a,0,i))}h(this.shapeType,s)&&(n.points=s)}if(o.occluded&&(r("occluded",e.occluded,"boolean",null),n.occluded=e.occluded),o.group&&(r("group",e.group,"integer",null),n.group=e.group),o.zOrder&&(r("zOrder",e.zOrder,"integer",null),n.zOrder=e.zOrder),o.lock&&(r("lock",e.lock,"boolean",null),n.lock=e.lock),o.color){if(r("color",e.color,"string",null),/^#[0-9A-F]{6}$/i.test(e.color))throw new c(`Got invalid color value: "${e.color}"`);n.color=e.color}o.reset();for(const t of Object.keys(n))t in this&&(this[t]=n[t]);return p.call(this,t,this.get(t))}}class y extends g{constructor(t,e,n,r){super(t,e,n,r),this.shapes=t.shapes.reduce((t,e)=>{t[e.frame]={serverID:e.id,occluded:e.occluded,zOrder:e.z_order,points:e.points,outside:e.outside,attributes:e.attributes.reduce((t,e)=>(t[e.spec_id]=e.value,t),{})};const n=this._getZ(e.frame);return n.max=Math.max(n.max,e.z_order),n.min=Math.min(n.min,e.z_order),t},{}),this.cache={}}toJSON(){const t=this.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});return{clientID:this.clientID,id:this.serverID,frame:this.frame,label_id:this.label.id,group:this.group,attributes:Object.keys(this.attributes).reduce((e,n)=>(t[n].mutable||e.push({spec_id:n,value:this.attributes[n]}),e),[]),shapes:Object.keys(this.shapes).reduce((e,n)=>(e.push({type:this.shapeType,occluded:this.shapes[n].occluded,z_order:this.shapes[n].zOrder,points:[...this.shapes[n].points],outside:this.shapes[n].outside,attributes:Object.keys(this.shapes[n].attributes).reduce((e,r)=>(t[r].mutable&&e.push({spec_id:r,value:this.shapes[n].attributes[r]}),e),[]),id:this.shapes[n].serverID,frame:+n}),e),[])}}get(t){if(!(t in this.cache)){const e=Object.assign({},this.getPosition(t),{attributes:this.getAttributes(t),group:this.group,objectType:i.TRACK,shapeType:this.shapeType,clientID:this.clientID,serverID:this.serverID,lock:this.lock,color:this.color});this.cache[t]=e}const e=JSON.parse(JSON.stringify(this.cache[t]));return e.label=this.label,e}neighborsFrames(t){const e=Object.keys(this.shapes).map(t=>+t);let n=Number.MAX_SAFE_INTEGER,r=Number.MAX_SAFE_INTEGER;for(const o of e){const e=Math.abs(t-o);o<=t&&e<n?n=e:e<r&&(r=e)}return{leftFrame:n===Number.MAX_SAFE_INTEGER?null:t-n,rightFrame:r===Number.MAX_SAFE_INTEGER?null:t+r}}getAttributes(t){const e={};for(const t in this.attributes)Object.prototype.hasOwnProperty.call(this.attributes,t)&&(e[t]=this.attributes[t]);const n=Object.keys(this.shapes).sort((t,e)=>+t-+e);for(const r of n)if(r<=t){const{attributes:t}=this.shapes[r];for(const n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])}return e}save(t,e){if(this.lock&&e.lock)return p.call(this,t,this.get(t));const n=Object.assign(this.get(t));n.attributes=Object.assign(n.attributes),n.points=[...n.points];const o=e.updateFlags;let i=!1;o.label&&(r("label",e.label,null,l),n.label=e.label,n.attributes={},this.appendDefaultAttributes.call(n,n.label));const s=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});if(o.attributes)for(const t of Object.keys(e.attributes)){const r=e.attributes[t];if(!(t in s&&d(r,s[t])))throw new c(`Trying to save unknown attribute with id ${t} and value ${r}`);n.attributes[t]=r}if(o.points){r("points",e.points,null,Array),f(this.shapeType,e.points);const{width:o,height:s}=this.frameMeta[t],a=[];for(let t=0;t<e.points.length-1;t+=2){const n=e.points[t],i=e.points[t+1];r("coordinate",n,"number",null),r("coordinate",i,"number",null),a.push(Math.clamp(n,0,o),Math.clamp(i,0,s))}h(this.shapeType,a)&&(n.points=a,i=!0)}if(o.occluded&&(r("occluded",e.occluded,"boolean",null),n.occluded=e.occluded,i=!0),o.outside&&(r("outside",e.outside,"boolean",null),n.outside=e.outside,i=!0),o.group&&(r("group",e.group,"integer",null),n.group=e.group),o.zOrder&&(r("zOrder",e.zOrder,"integer",null),n.zOrder=e.zOrder,i=!0),o.lock&&(r("lock",e.lock,"boolean",null),n.lock=e.lock),o.color){if(r("color",e.color,"string",null),/^#[0-9A-F]{6}$/i.test(e.color))throw new c(`Got invalid color value: "${e.color}"`);n.color=e.color}o.keyframe&&r("keyframe",e.keyframe,"boolean",null);for(const e of Object.keys(n))e in this&&(this[e]=n[e]),this.cache[t][e]=n[e];if(o.attributes)for(const r of Object.keys(n.attributes))s[r].mutable||(this.shapes[t].attributes[r]=e.attributes[r],this.shapes[t].attributes[r]=e.attributes[r]);if(o.label)for(const t of Object.values(this.shapes))t.attributes={};if(o.keyframe&&!e.keyframe){for(const e in this.cache)+e>t&&delete this.cache[e];return this.cache[t].keyframe=!1,delete this.shapes[t],o.reset(),p.call(this,t,this.get(t))}if(i||o.keyframe&&e.keyframe){for(const e in this.cache)+e>t&&delete this.cache[e];if(this.cache[t].keyframe=!0,e.keyframe=!0,this.shapes[t]={frame:t,zOrder:n.zOrder,points:n.points,outside:n.outside,occluded:n.occluded,attributes:{}},o.attributes)for(const r of Object.keys(n.attributes))s[r].mutable&&(this.shapes[t].attributes[r]=e.attributes[r],this.shapes[t].attributes[r]=e.attributes[r])}return o.reset(),p.call(this,t,this.get(t))}getPosition(t){const{leftFrame:e,rightFrame:n}=this.neighborsFrames(t),r=Number.isInteger(n)?this.shapes[n]:null,o=Number.isInteger(e)?this.shapes[e]:null;if(o&&e===t)return{points:[...o.points],occluded:o.occluded,outside:o.outside,zOrder:o.zOrder,keyframe:!0};if(r&&o)return Object.assign({},this.interpolatePosition(o,r,(t-e)/(n-e)),{keyframe:!1});if(r)return{points:[...r.points],occluded:r.occluded,outside:!0,zOrder:0,keyframe:!1};if(o)return{points:[...o.points],occluded:o.occluded,outside:o.outside,zOrder:0,keyframe:!1};throw new u(`No one neightbour frame found for the track with client ID: "${this.id}"`)}delete(t){return this.lock&&!t||(this.removed=!0,this.resetCache()),!0}resetCache(){this.cache={}}}class v extends m{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=o.RECTANGLE,f(this.shapeType,this.points)}static distance(t,e,n){const[r,o,i,s]=t;return e>=r&&e<=i&&n>=o&&n<=s?Math.min.apply(null,[e-r,n-o,i-e,s-n]):null}}class w extends m{constructor(t,e,n,r){super(t,e,n,r)}}class O extends w{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=o.POLYGON,f(this.shapeType,this.points)}static distance(t,e,n){function r(t,r,o,i){return(o-t)*(n-r)-(e-t)*(i-r)}let o=0;const i=[];for(let s=0,a=t.length-2;s<t.length-1;a=s,s+=2){const c=t[a],u=t[a+1],l=t[s],p=t[s+1];u<=n?p>n&&r(c,u,l,p)>0&&o++:p<=n&&r(c,u,l,p)<0&&o--;const f=e-(u-p),h=n-(l-c);(f-c)*(l-f)>=0&&(h-u)*(p-h)>=0?i.push(Math.sqrt(Math.pow(e-f,2)+Math.pow(n-h,2))):i.push(Math.min(Math.sqrt(Math.pow(c-e,2)+Math.pow(u-n,2)),Math.sqrt(Math.pow(l-e,2)+Math.pow(p-n,2))))}return 0!==o?Math.min.apply(null,i):null}}class x extends w{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=o.POLYLINE,f(this.shapeType,this.points)}static distance(t,e,n){const r=[];for(let o=0;o<t.length-2;o+=2){const i=t[o],s=t[o+1],a=t[o+2],c=t[o+3];(e-i)*(a-e)>=0&&(n-s)*(c-n)>=0?r.push(Math.abs((c-s)*e-(a-i)*n+a*s-c*i)/Math.sqrt(Math.pow(c-s,2)+Math.pow(a-i,2))):r.push(Math.min(Math.sqrt(Math.pow(i-e,2)+Math.pow(s-n,2)),Math.sqrt(Math.pow(a-e,2)+Math.pow(c-n,2))))}return Math.min.apply(null,r)}}class j extends w{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=o.POINTS,f(this.shapeType,this.points)}static distance(t,e,n){const r=[];for(let o=0;o<t.length;o+=2){const 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Call annotations.get() or annotations.clear(true) before")},uploadAnnotations:async function(t,n,r){const o=t instanceof s?"task":"job";if(!(r instanceof a))throw new p("A loader must be instance of Loader class");await e.annotations.uploadAnnotations(o,t.id,n,r.name)},dumpAnnotations:async function(t,n,r){if(!(r instanceof c))throw new p("A dumper must be instance of Dumper class");let o=null;return o="job"==(t instanceof s?"task":"job")?await e.annotations.dumpAnnotations(t.task.id,n,r.name):await e.annotations.dumpAnnotations(t.id,n,r.name)}}})()},function(t,e,n){n(4),n(87),n(8),n(52),(()=>{const{RectangleShape:e,PolygonShape:r,PolylineShape:o,PointsShape:i,RectangleTrack:s,PolygonTrack:a,PolylineTrack:c,PointsTrack:u,Track:l,Shape:p,Tag:f,objectStateFactory:h}=n(159),{checkObjectType:d}=n(39),b=n(85),{Label:g}=n(38),{DataError:m,ArgumentError:y,ScriptingError:v}=n(5),{ObjectShape:w,ObjectType:O}=n(20),x=n(51),j=["#0066FF","#AF593E","#01A368","#FF861F","#ED0A3F","#FF3F34","#76D7EA","#8359A3","#FBE870","#C5E17A","#03BB85","#FFDF00","#8B8680","#0A6B0D","#8FD8D8","#A36F40","#F653A6","#CA3435","#FFCBA4","#FF99CC","#FA9D5A","#FFAE42","#A78B00","#788193","#514E49","#1164B4","#F4FA9F","#FED8B1","#C32148","#01796F","#E90067","#FF91A4","#404E5A","#6CDAE7","#FFC1CC","#006A93","#867200","#E2B631","#6EEB6E","#FFC800","#CC99BA","#FF007C","#BC6CAC","#DCCCD7","#EBE1C2","#A6AAAE","#B99685","#0086A7","#5E4330","#C8A2C8","#708EB3","#BC8777","#B2592D","#497E48","#6A2963","#E6335F","#00755E","#B5A895","#0048ba","#EED9C4","#C88A65","#FF6E4A","#87421F","#B2BEB5","#926F5B","#00B9FB","#6456B7","#DB5079","#C62D42","#FA9C44","#DA8A67","#FD7C6E","#93CCEA","#FCF686","#503E32","#FF5470","#9DE093","#FF7A00","#4F69C6","#A50B5E","#F0E68C","#FDFF00","#F091A9","#FFFF66","#6F9940","#FC74FD","#652DC1","#D6AEDD","#EE34D2","#BB3385","#6B3FA0","#33CC99","#FFDB00","#87FF2A","#6EEB6E","#FFC800","#CC99BA","#7A89B8","#006A93","#867200","#E2B631","#D9D6CF"];function k(t,n,s){const{type:a}=t,c=j[n%j.length];let u=null;switch(a){case"rectangle":u=new e(t,n,c,s);break;case"polygon":u=new r(t,n,c,s);break;case"polyline":u=new o(t,n,c,s);break;case"points":u=new i(t,n,c,s);break;default:throw new m(`An unexpected type of shape "${a}"`)}return u}function S(t,e,n){if(t.shapes.length){const{type:r}=t.shapes[0],o=j[e%j.length];let i=null;switch(r){case"rectangle":i=new s(t,e,o,n);break;case"polygon":i=new a(t,e,o,n);break;case"polyline":i=new c(t,e,o,n);break;case"points":i=new u(t,e,o,n);break;default:throw new m(`An unexpected type of track "${r}"`)}return i}return console.warn("The track without any shapes had been found. It was ignored."),null}t.exports=class{constructor(t){this.startFrame=t.startFrame,this.stopFrame=t.stopFrame,this.frameMeta=t.frameMeta,this.labels=t.labels.reduce((t,e)=>(t[e.id]=e,t),{}),this.shapes={},this.tags={},this.tracks=[],this.objects={},this.count=0,this.flush=!1,this.collectionZ={},this.groups={max:0},this.injection={labels:this.labels,collectionZ:this.collectionZ,groups:this.groups,frameMeta:this.frameMeta}}import(t){for(const e of t.tags){const t=++this.count,n=new f(e,t,this.injection);this.tags[n.frame]=this.tags[n.frame]||[],this.tags[n.frame].push(n),this.objects[t]=n}for(const e of t.shapes){const t=++this.count,n=k(e,t,this.injection);this.shapes[n.frame]=this.shapes[n.frame]||[],this.shapes[n.frame].push(n),this.objects[t]=n}for(const e of t.tracks){const t=++this.count,n=S(e,t,this.injection);n&&(this.tracks.push(n),this.objects[t]=n)}return this}export(){return{tracks:this.tracks.filter(t=>!t.removed).map(t=>t.toJSON()),shapes:Object.values(this.shapes).reduce((t,e)=>(t.push(...e),t),[]).filter(t=>!t.removed).map(t=>t.toJSON()),tags:Object.values(this.tags).reduce((t,e)=>(t.push(...e),t),[]).filter(t=>!t.removed).map(t=>t.toJSON())}}get(t){const{tracks:e}=this,n=this.shapes[t]||[],r=this.tags[t]||[],o=e.concat(n).concat(r).filter(t=>!t.removed),i=[];for(const e of o){const n=e.get(t);if(n.outside&&!n.keyframe)continue;const r=h.call(e,t,n);i.push(r)}return i}merge(t){if(d("shapes for merge",t,null,Array),!t.length)return;const e=t.map(t=>{d("object state",t,null,x);const e=this.objects[t.clientID];if(void 0===e)throw new y("The object has not been saved yet. Call ObjectState.put([state]) before you can merge it");return e}),n={},{label:r,shapeType:o}=t[0];if(!(r.id in this.labels))throw new y(`Unknown label for the task: ${r.id}`);if(!Object.values(w).includes(o))throw new y(`Got unknown shapeType "${o}"`);const i=r.attributes.reduce((t,e)=>(t[e.id]=e,t),{});for(let s=0;s<e.length;s++){const a=e[s],c=t[s];if(c.label.id!==r.id)throw new y(`All shape labels are expected to be ${r.name}, but got ${c.label.name}`);if(c.shapeType!==o)throw new y(`All shapes are expected to be ${o}, but got ${c.shapeType}`);if(a instanceof p){if(a.frame in n&&!n[a.frame].outside)throw new y("Expected only one visible shape per frame");n[a.frame]={type:o,frame:a.frame,points:[...a.points],occluded:a.occluded,zOrder:a.zOrder,outside:!1,attributes:Object.keys(a.attributes).reduce((t,e)=>(e in i&&i[e].mutable&&t.push({spec_id:+e,value:a.attributes[e]}),t),[])},a.frame+1 in n||(n[a.frame+1]=JSON.parse(JSON.stringify(n[a.frame])),n[a.frame+1].outside=!0,n[a.frame+1].frame++)}else{if(!(a instanceof l))throw new y(`Trying to merge unknown object type: ${a.constructor.name}. `+"Only shapes and tracks are expected.");{const t={};for(const e of Object.keys(a.shapes)){const r=a.shapes[e];if(e in n&&!n[e].outside){if(r.outside)continue;throw new y("Expected only one visible shape per frame")}let i=!1;for(const e in r.attributes)e in t&&t[e]===r.attributes[e]||(i=!0,t[e]=r.attributes[e]);n[e]={type:o,frame:+e,points:[...r.points],occluded:r.occluded,outside:r.outside,zOrder:r.zOrder,attributes:i?Object.keys(t).reduce((e,n)=>(e.push({spec_id:+n,value:t[n]}),e),[]):[]}}}}}let s=!1;for(const t of Object.keys(n).sort((t,e)=>+t-+e)){if((s=s||n[t].outside)||!n[t].outside)break;delete n[t]}const a=++this.count,c=S({frame:Math.min.apply(null,Object.keys(n).map(t=>+t)),shapes:Object.values(n),group:0,label_id:r.id,attributes:Object.keys(t[0].attributes).reduce((e,n)=>(i[n].mutable||e.push({spec_id:+n,value:t[0].attributes[n]}),e),[])},a,this.injection);this.tracks.push(c),this.objects[a]=c;for(const t of e)t.removed=!0,"function"==typeof t.resetCache&&t.resetCache()}split(t,e){d("object state",t,null,x),d("frame",e,"integer",null);const n=this.objects[t.clientID];if(void 0===n)throw new y("The object has not been saved yet. Call annotations.put([state]) before");if(t.objectType!==O.TRACK)return;const r=Object.keys(n.shapes).sort((t,e)=>+t-+e);if(e<=+r[0]||e>r[r.length-1])return;const o=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{}),i=n.toJSON(),s={type:t.shapeType,points:[...t.points],occluded:t.occluded,outside:t.outside,zOrder:0,attributes:Object.keys(t.attributes).reduce((e,n)=>(o[n].mutable||e.push({spec_id:+n,value:t.attributes[n]}),e),[]),frame:e},a={frame:i.frame,group:0,label_id:i.label_id,attributes:i.attributes,shapes:[]},c=JSON.parse(JSON.stringify(a));c.frame=e,c.shapes.push(JSON.parse(JSON.stringify(s))),i.shapes.map(t=>(delete t.id,t.frame<e?a.shapes.push(JSON.parse(JSON.stringify(t))):t.frame>e&&c.shapes.push(JSON.parse(JSON.stringify(t))),t)),a.shapes.push(s),a.shapes[a.shapes.length-1].outside=!0;let u=++this.count;const l=S(a,u,this.injection);this.tracks.push(l),this.objects[u]=l,u=++this.count;const p=S(c,u,this.injection);this.tracks.push(p),this.objects[u]=p,n.removed=!0,n.resetCache()}group(t,e){d("shapes for group",t,null,Array);const n=t.map(t=>{d("object state",t,null,x);const e=this.objects[t.clientID];if(void 0===e)throw new y("The object has not been saved yet. Call annotations.put([state]) before");return e}),r=e?0:++this.groups.max;for(const t of n)t.group=r,"function"==typeof t.resetCache&&t.resetCache();return r}clear(){this.shapes={},this.tags={},this.tracks=[],this.objects={},this.count=0,this.flush=!0}statistics(){const t={},e={rectangle:{shape:0,track:0},polygon:{shape:0,track:0},polyline:{shape:0,track:0},points:{shape:0,track:0},tags:0,manually:0,interpolated:0,total:0},n=JSON.parse(JSON.stringify(e));for(const n of Object.values(this.labels)){const{name:r}=n;t[r]=JSON.parse(JSON.stringify(e))}for(const e of Object.values(this.objects)){let n=null;if(e instanceof p)n="shape";else if(e instanceof l)n="track";else{if(!(e instanceof f))throw new v(`Unexpected object type: "${n}"`);n="tag"}const r=e.label.name;if("tag"===n)t[r].tags++,t[r].manually++,t[r].total++;else{const{shapeType:o}=e;if(t[r][o][n]++,"track"===n){const n=Object.keys(e.shapes).sort((t,e)=>+t-+e).map(t=>+t);let o=n[0],i=!1;for(const s of n){if(i){const e=s-o-1;t[r].interpolated+=e,t[r].total+=e}i=!e.shapes[s].outside,o=s,i&&(t[r].manually++,t[r].total++)}const s=n[n.length-1];if(s!==this.stopFrame&&!e.shapes[s].outside){const e=this.stopFrame-s;t[r].interpolated+=e,t[r].total+=e}}else t[r].manually++,t[r].total++}}for(const e of Object.keys(t))for(const r of Object.keys(t[e]))if("object"==typeof t[e][r])for(const o of Object.keys(t[e][r]))n[r][o]+=t[e][r][o];else n[r]+=t[e][r];return new b(t,n)}put(t){d("shapes for put",t,null,Array);const e={shapes:[],tracks:[],tags:[]};function n(t,e){const n=+e,r=this.attributes[e];return d("attribute id",n,"integer",null),d("attribute value",r,"string",null),t.push({spec_id:n,value:r}),t}for(const r of t){d("object state",r,null,x),d("state client ID",r.clientID,"undefined",null),d("state frame",r.frame,"integer",null),d("state attributes",r.attributes,null,Object),d("state label",r.label,null,g);const t=Object.keys(r.attributes).reduce(n.bind(r),[]),o=r.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});if("tag"===r.objectType)e.tags.push({attributes:t,frame:r.frame,label_id:r.label.id,group:0});else{d("state occluded",r.occluded,"boolean",null),d("state points",r.points,null,Array);for(const t of r.points)d("point coordinate",t,"number",null);if(!Object.values(w).includes(r.shapeType))throw new y("Object shape must be one of: "+`${JSON.stringify(Object.values(w))}`);if("shape"===r.objectType)e.shapes.push({attributes:t,frame:r.frame,group:0,label_id:r.label.id,occluded:r.occluded||!1,points:[...r.points],type:r.shapeType,z_order:0});else{if("track"!==r.objectType)throw new y("Object type must be one of: "+`${JSON.stringify(Object.values(O))}`);e.tracks.push({attributes:t.filter(t=>!o[t.spec_id].mutable),frame:r.frame,group:0,label_id:r.label.id,shapes:[{attributes:t.filter(t=>o[t.spec_id].mutable),frame:r.frame,occluded:r.occluded||!1,outside:!1,points:[...r.points],type:r.shapeType,z_order:0}]})}}}this.import(e)}select(t,e,n){d("shapes for select",t,null,Array),d("x coordinate",e,"number",null),d("y coordinate",n,"number",null);let r=null,o=null;for(const i of t){if(d("object state",i,null,x),i.outside)continue;const t=this.objects[i.clientID];if(void 0===t)throw new y("The object has not been saved yet. Call annotations.put([state]) before");const s=t.constructor.distance(i.points,e,n);null!==s&&(null===r||s<r)&&(r=s,o=i)}return{state:o,distance:r}}}})()},function(t,e,n){"use strict";var r=n(2);t.exports=function(t,e){var n=[][t];return!n||!r(function(){n.call(null,e||function(){throw 1},1)})}},function(t,e,n){n(4),n(87),n(8),(()=>{const e=n(51),{checkObjectType:r,isEnum:o}=n(39),{ObjectShape:i,ObjectType:s,AttributeType:a,VisibleState:c}=n(20),{DataError:u,ArgumentError:l,ScriptingError:p}=n(5),{Label:f}=n(38);function h(t,n){const r=new e(n);return r.hidden={save:this.save.bind(this,t,r),delete:this.delete.bind(this),up:this.up.bind(this,t,r),down:this.down.bind(this,t,r)},r}function d(t,e){if(t===i.RECTANGLE){if(e.length/2!=2)throw new u(`Rectangle must have 2 points, but got ${e.length/2}`)}else if(t===i.POLYGON){if(e.length/2<3)throw new u(`Polygon must have at least 3 points, but got ${e.length/2}`)}else if(t===i.POLYLINE){if(e.length/2<2)throw new u(`Polyline must have at least 2 points, but got ${e.length/2}`)}else{if(t!==i.POINTS)throw new l(`Unknown value of shapeType has been recieved ${t}`);if(e.length/2<1)throw new u(`Points must have at least 1 points, but got ${e.length/2}`)}}function b(t,e){if(t===i.POINTS)return!0;let n=Number.MAX_SAFE_INTEGER,r=Number.MIN_SAFE_INTEGER,o=Number.MAX_SAFE_INTEGER,s=Number.MIN_SAFE_INTEGER;for(let t=0;t<e.length-1;t+=2)n=Math.min(n,e[t]),r=Math.max(r,e[t]),o=Math.min(o,e[t+1]),s=Math.max(s,e[t+1]);if(t===i.POLYLINE){return Math.max(r-n,s-o)>=3}return(r-n)*(s-o)>=9}function g(t,e){const{values:n}=e,r=e.inputType;if("string"!=typeof t)throw new l(`Attribute value is expected to be string, but got ${typeof t}`);return r===a.NUMBER?+t>=+n[0]&&+t<=+n[1]&&!((+t-+n[0])%+n[2]):r===a.CHECKBOX?["true","false"].includes(t.toLowerCase()):n.includes(t)}class m{constructor(t,e,n){this.taskLabels=n.labels,this.clientID=e,this.serverID=t.id,this.group=t.group,this.label=this.taskLabels[t.label_id],this.frame=t.frame,this.removed=!1,this.lock=!1,this.attributes=t.attributes.reduce((t,e)=>(t[e.spec_id]=e.value,t),{}),this.appendDefaultAttributes(this.label),n.groups.max=Math.max(n.groups.max,this.group)}appendDefaultAttributes(t){const e=t.attributes;for(const t of e)t.id in this.attributes||(this.attributes[t.id]=t.defaultValue)}delete(t){return this.lock&&!t||(this.removed=!0),!0}}class y extends m{constructor(t,e,n,r){super(t,e,r),this.frameMeta=r.frameMeta,this.collectionZ=r.collectionZ,this.visibility=c.SHAPE,this.color=n,this.shapeType=null}_getZ(t){return this.collectionZ[t]=this.collectionZ[t]||{max:0,min:0},this.collectionZ[t]}save(){throw new p("Is not implemented")}get(){throw new p("Is not implemented")}toJSON(){throw new p("Is not implemented")}up(t,e){const n=this._getZ(t);n.max++,e.zOrder=n.max}down(t,e){const n=this._getZ(t);n.min--,e.zOrder=n.min}}class v extends y{constructor(t,e,n,r){super(t,e,n,r),this.points=t.points,this.occluded=t.occluded,this.zOrder=t.z_order;const o=this._getZ(this.frame);o.max=Math.max(o.max,this.zOrder||0),o.min=Math.min(o.min,this.zOrder||0)}toJSON(){return{type:this.shapeType,clientID:this.clientID,occluded:this.occluded,z_order:this.zOrder,points:[...this.points],attributes:Object.keys(this.attributes).reduce((t,e)=>(t.push({spec_id:e,value:this.attributes[e]}),t),[]),id:this.serverID,frame:this.frame,label_id:this.label.id,group:this.group}}get(t){if(t!==this.frame)throw new p("Got frame is not equal to the frame of the shape");return{objectType:s.SHAPE,shapeType:this.shapeType,clientID:this.clientID,serverID:this.serverID,occluded:this.occluded,lock:this.lock,zOrder:this.zOrder,points:[...this.points],attributes:Object.assign({},this.attributes),label:this.label,group:this.group,color:this.color,visibility:this.visibility}}save(t,e){if(t!==this.frame)throw new p("Got frame is not equal to the frame of the shape");if(this.lock&&e.lock)return h.call(this,t,this.get(t));const n=this.get(t),i=e.updateFlags;if(i.label&&(r("label",e.label,null,f),n.label=e.label,n.attributes={},this.appendDefaultAttributes.call(n,n.label)),i.attributes){const t=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});for(const r of Object.keys(e.attributes)){const o=e.attributes[r];if(!(r in t&&g(o,t[r])))throw new l(`Trying to save unknown attribute with id ${r} and value ${o}`);n.attributes[r]=o}}if(i.points){r("points",e.points,null,Array),d(this.shapeType,e.points);const{width:o,height:i}=this.frameMeta[t],s=[];for(let t=0;t<e.points.length-1;t+=2){const n=e.points[t],a=e.points[t+1];r("coordinate",n,"number",null),r("coordinate",a,"number",null),s.push(Math.clamp(n,0,o),Math.clamp(a,0,i))}b(this.shapeType,s)&&(n.points=s)}if(i.occluded&&(r("occluded",e.occluded,"boolean",null),n.occluded=e.occluded),i.group&&(r("group",e.group,"integer",null),n.group=e.group),i.zOrder&&(r("zOrder",e.zOrder,"integer",null),n.zOrder=e.zOrder),i.lock&&(r("lock",e.lock,"boolean",null),n.lock=e.lock),i.color){if(r("color",e.color,"string",null),/^#[0-9A-F]{6}$/i.test(e.color))throw new l(`Got invalid color value: "${e.color}"`);n.color=e.color}if(i.visibility){if(!o.call(c,e.visibility))throw new l(`Got invalid visibility value: "${e.visibility}"`);n.visibility=e.visibility}i.reset();for(const t of Object.keys(n))t in this&&(this[t]=n[t]);return h.call(this,t,this.get(t))}}class w extends y{constructor(t,e,n,r){super(t,e,n,r),this.shapes=t.shapes.reduce((t,e)=>{t[e.frame]={serverID:e.id,occluded:e.occluded,zOrder:e.z_order,points:e.points,outside:e.outside,attributes:e.attributes.reduce((t,e)=>(t[e.spec_id]=e.value,t),{})};const n=this._getZ(e.frame);return n.max=Math.max(n.max,e.z_order),n.min=Math.min(n.min,e.z_order),t},{}),this.cache={}}toJSON(){const t=this.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});return{clientID:this.clientID,id:this.serverID,frame:this.frame,label_id:this.label.id,group:this.group,attributes:Object.keys(this.attributes).reduce((e,n)=>(t[n].mutable||e.push({spec_id:n,value:this.attributes[n]}),e),[]),shapes:Object.keys(this.shapes).reduce((e,n)=>(e.push({type:this.shapeType,occluded:this.shapes[n].occluded,z_order:this.shapes[n].zOrder,points:[...this.shapes[n].points],outside:this.shapes[n].outside,attributes:Object.keys(this.shapes[n].attributes).reduce((e,r)=>(t[r].mutable&&e.push({spec_id:r,value:this.shapes[n].attributes[r]}),e),[]),id:this.shapes[n].serverID,frame:+n}),e),[])}}get(t){if(!(t in this.cache)){const e=Object.assign({},this.getPosition(t),{attributes:this.getAttributes(t),group:this.group,objectType:s.TRACK,shapeType:this.shapeType,clientID:this.clientID,serverID:this.serverID,lock:this.lock,color:this.color,visibility:this.visibility});this.cache[t]=e}const e=JSON.parse(JSON.stringify(this.cache[t]));return e.label=this.label,e}neighborsFrames(t){const e=Object.keys(this.shapes).map(t=>+t);let n=Number.MAX_SAFE_INTEGER,r=Number.MAX_SAFE_INTEGER;for(const o of e){const e=Math.abs(t-o);o<=t&&e<n?n=e:e<r&&(r=e)}return{leftFrame:n===Number.MAX_SAFE_INTEGER?null:t-n,rightFrame:r===Number.MAX_SAFE_INTEGER?null:t+r}}getAttributes(t){const e={};for(const t in this.attributes)Object.prototype.hasOwnProperty.call(this.attributes,t)&&(e[t]=this.attributes[t]);const n=Object.keys(this.shapes).sort((t,e)=>+t-+e);for(const r of n)if(r<=t){const{attributes:t}=this.shapes[r];for(const n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])}return e}save(t,e){if(this.lock&&e.lock)return h.call(this,t,this.get(t));const n=Object.assign(this.get(t));n.attributes=Object.assign(n.attributes),n.points=[...n.points];const i=e.updateFlags;let s=!1;i.label&&(r("label",e.label,null,f),n.label=e.label,n.attributes={},this.appendDefaultAttributes.call(n,n.label));const a=n.label.attributes.reduce((t,e)=>(t[e.id]=e,t),{});if(i.attributes)for(const t of Object.keys(e.attributes)){const r=e.attributes[t];if(!(t in a&&g(r,a[t])))throw new l(`Trying to save unknown attribute with id ${t} and value ${r}`);n.attributes[t]=r}if(i.points){r("points",e.points,null,Array),d(this.shapeType,e.points);const{width:o,height:i}=this.frameMeta[t],a=[];for(let t=0;t<e.points.length-1;t+=2){const n=e.points[t],s=e.points[t+1];r("coordinate",n,"number",null),r("coordinate",s,"number",null),a.push(Math.clamp(n,0,o),Math.clamp(s,0,i))}b(this.shapeType,a)&&(n.points=a,s=!0)}if(i.occluded&&(r("occluded",e.occluded,"boolean",null),n.occluded=e.occluded,s=!0),i.outside&&(r("outside",e.outside,"boolean",null),n.outside=e.outside,s=!0),i.group&&(r("group",e.group,"integer",null),n.group=e.group),i.zOrder&&(r("zOrder",e.zOrder,"integer",null),n.zOrder=e.zOrder,s=!0),i.lock&&(r("lock",e.lock,"boolean",null),n.lock=e.lock),i.color){if(r("color",e.color,"string",null),/^#[0-9A-F]{6}$/i.test(e.color))throw new l(`Got invalid color value: "${e.color}"`);n.color=e.color}if(i.visibility){if(!o.call(c,e.visibility))throw new l(`Got invalid visibility value: "${e.visibility}"`);n.visibility=e.visibility}i.keyframe&&r("keyframe",e.keyframe,"boolean",null);for(const e of Object.keys(n))e in this&&(this[e]=n[e]),this.cache[t][e]=n[e];if(i.attributes)for(const r of Object.keys(n.attributes))a[r].mutable||(this.shapes[t].attributes[r]=e.attributes[r],this.shapes[t].attributes[r]=e.attributes[r]);if(i.label)for(const t of Object.values(this.shapes))t.attributes={};if(i.keyframe&&!e.keyframe){for(const e in this.cache)+e>t&&delete this.cache[e];return this.cache[t].keyframe=!1,delete this.shapes[t],i.reset(),h.call(this,t,this.get(t))}if(s||i.keyframe&&e.keyframe){for(const e in this.cache)+e>t&&delete this.cache[e];if(this.cache[t].keyframe=!0,e.keyframe=!0,this.shapes[t]={frame:t,zOrder:n.zOrder,points:n.points,outside:n.outside,occluded:n.occluded,attributes:{}},i.attributes)for(const r of Object.keys(n.attributes))a[r].mutable&&(this.shapes[t].attributes[r]=e.attributes[r],this.shapes[t].attributes[r]=e.attributes[r])}return i.reset(),h.call(this,t,this.get(t))}getPosition(t){const{leftFrame:e,rightFrame:n}=this.neighborsFrames(t),r=Number.isInteger(n)?this.shapes[n]:null,o=Number.isInteger(e)?this.shapes[e]:null;if(o&&e===t)return{points:[...o.points],occluded:o.occluded,outside:o.outside,zOrder:o.zOrder,keyframe:!0};if(r&&o)return Object.assign({},this.interpolatePosition(o,r,(t-e)/(n-e)),{keyframe:!1});if(r)return{points:[...r.points],occluded:r.occluded,outside:!0,zOrder:0,keyframe:!1};if(o)return{points:[...o.points],occluded:o.occluded,outside:o.outside,zOrder:0,keyframe:!1};throw new p(`No one neightbour frame found for the track with client ID: "${this.id}"`)}delete(t){return this.lock&&!t||(this.removed=!0,this.resetCache()),!0}resetCache(){this.cache={}}}class O extends v{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.RECTANGLE,d(this.shapeType,this.points)}static distance(t,e,n){const[r,o,i,s]=t;return e>=r&&e<=i&&n>=o&&n<=s?Math.min.apply(null,[e-r,n-o,i-e,s-n]):null}}class x extends v{constructor(t,e,n,r){super(t,e,n,r)}}class j extends x{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POLYGON,d(this.shapeType,this.points)}static distance(t,e,n){function r(t,r,o,i){return(o-t)*(n-r)-(e-t)*(i-r)}let o=0;const i=[];for(let s=0,a=t.length-2;s<t.length-1;a=s,s+=2){const c=t[a],u=t[a+1],l=t[s],p=t[s+1];u<=n?p>n&&r(c,u,l,p)>0&&o++:p<=n&&r(c,u,l,p)<0&&o--;const f=e-(u-p),h=n-(l-c);(f-c)*(l-f)>=0&&(h-u)*(p-h)>=0?i.push(Math.sqrt(Math.pow(e-f,2)+Math.pow(n-h,2))):i.push(Math.min(Math.sqrt(Math.pow(c-e,2)+Math.pow(u-n,2)),Math.sqrt(Math.pow(l-e,2)+Math.pow(p-n,2))))}return 0!==o?Math.min.apply(null,i):null}}class k extends x{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POLYLINE,d(this.shapeType,this.points)}static distance(t,e,n){const r=[];for(let o=0;o<t.length-2;o+=2){const i=t[o],s=t[o+1],a=t[o+2],c=t[o+3];(e-i)*(a-e)>=0&&(n-s)*(c-n)>=0?r.push(Math.abs((c-s)*e-(a-i)*n+a*s-c*i)/Math.sqrt(Math.pow(c-s,2)+Math.pow(a-i,2))):r.push(Math.min(Math.sqrt(Math.pow(i-e,2)+Math.pow(s-n,2)),Math.sqrt(Math.pow(a-e,2)+Math.pow(c-n,2))))}return Math.min.apply(null,r)}}class S extends x{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POINTS,d(this.shapeType,this.points)}static distance(t,e,n){const r=[];for(let o=0;o<t.length;o+=2){const i=t[o],s=t[o+1];r.push(Math.sqrt(Math.pow(i-e,2)+Math.pow(s-n,2)))}return Math.min.apply(null,r)}}class A extends w{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.RECTANGLE;for(const t of Object.values(this.shapes))d(this.shapeType,t.points)}interpolatePosition(t,e,n){const r=[e.points[0]-t.points[0],e.points[1]-t.points[1],e.points[2]-t.points[2],e.points[3]-t.points[3]];return{points:[t.points[0]+r[0]*n,t.points[1]+r[1]*n,t.points[2]+r[2]*n,t.points[3]+r[3]*n],occluded:t.occluded,outside:t.outside,zOrder:t.zOrder}}}class E extends w{constructor(t,e,n,r){super(t,e,n,r)}interpolatePosition(t,e,n){function r(t){let e=Number.MAX_SAFE_INTEGER,n=Number.MAX_SAFE_INTEGER,r=Number.MIN_SAFE_INTEGER,o=Number.MIN_SAFE_INTEGER;for(let i=0;i<t.length;i+=2)t[i]<e&&(e=t[i]),t[i+1]<n&&(n=t[i+1]),t[i]>r&&(r=t[i]),t[i+1]>o&&(o=t[i+1]);return{xmin:e,ymin:n,xmax:r,ymax:o}}function o(t,e){const n=[],r=e.xmax-e.xmin,o=e.ymax-e.ymin;for(let i=0;i<t.length;i+=2)n.push((t[i]-e.xmin)/r,(t[i+1]-e.ymin)/o);return n}function i(t,e){const n=[],r=e.xmax-e.xmin,o=e.ymax-e.ymin;for(let i=0;i<t.length;i+=2)n.push(t[i]*r+e.xmin,t[i+1]*o+e.ymin);return n}function s(t){const e=[];for(let n=0;n<t.length;n+=2)e.push({x:t[n],y:t[n+1]});return e}function a(t){const e=[];for(const n of t)e.push(n.x,n.y);return e}function c(t,e){function n(t){let e=0;for(let n=1;n<t.length;n+=2){e+=Math.sqrt(Math.pow(t[n].x-t[n-1].x,2)+Math.pow(t[n].y-t[n-1].y,2))}return e||Number.MAX_SAFE_INTEGER}function r(t,e){let n=0;for(let r=1;r<t.length;r+=2){const o=Math.sqrt(Math.pow(t[r].x-t[r-1].x,2)+Math.pow(t[r].y-t[r-1].y,2));n+=Math.pow(o-e,2)}return n}const o=[],i=[],s=function(t,e){const n={};for(let r=0;r<t.length;r++){n[r]=n[r]||{};for(let o=0;o<e.length;o++){const i=t[r].x-e[o].x,s=t[r].y-e[o].y;n[r][o]=Math.sqrt(Math.pow(i,2)+Math.pow(s,2))}}return n}(t,e),a=function(t,e,n){const r={};for(const o of t)r[o]=e.concat().sort((t,e)=>n[o][t]-n[o][e]);const o={},i={};let s=0;for(;Object.values(i).length!==t.length;){for(const e of t){if(i[e])continue;const t=r[e][s],a=n[e][t];if(t in o&&o[t].distance>a){const e=o[t].value;delete o[t],delete i[e]}t in o||(o[t]={value:e,distance:a},i[e]=!0)}s++}const a={};for(const t of Object.keys(o))a[o[t].value]={value:t,distance:o[t].distance};return a}(Array.from(t.keys()),Array.from(e.keys()),s),c=(n(e)+n(t))/(e.length+t.length);!function(t,e){for(const n of Object.keys(t))t[n].distance>e&&delete t[n]}(a,c+3*Math.sqrt((r(t,c)+r(e,c))/(t.length+e.length)));for(const t of Object.keys(a))a[t]=a[t].value;const u=this.appendMapping(a,t,e);for(const n of u)o.push(t[n]),i.push(e[a[n]]);return[o,i]}let u=r(t.points),l=r(e.points);(u.xmax-u.xmin<1||l.ymax-l.ymin<1)&&(l=u={xmin:0,xmax:1024,ymin:0,ymax:768});const p=s(o(t.points,u)),f=s(o(e.points,l));let h=[],d=[];if(p.length>f.length){const[t,e]=c.call(this,f,p);h=e,d=t}else{const[t,e]=c.call(this,p,f);h=t,d=e}const b=i(a(h),u),g=i(a(d),l),m=[];for(let t=0;t<b.length;t++)m.push(b[t]+(g[t]-b[t])*n);return{points:m,occluded:t.occluded,outside:t.outside,zOrder:t.zOrder}}appendMapping(t,e,n){const r=Object.values(t).map(t=>+t),o=Object.keys(t).map(t=>+t),i=[];function s(t){let e=t,o=t;if(!r.length)throw new p("Interpolation mapping is empty");for(;!r.includes(e);)--e<0&&(e=n.length-1);for(;!r.includes(o);)++o>=n.length&&(o=0);return[e,o]}function a(t,e,r){const o=[];for(;e!==r;)o.push(n[e]),++e>=n.length&&(e=0);o.push(n[r]);let i=0,s=0,a=!1;for(let e=1;e<o.length;e++){const r=o[e],c=o[e-1],u=Math.sqrt(Math.pow(r.x-c.x,2)+Math.pow(r.y-c.y,2));a||(s+=u),i+=u,n[t]===o[e]&&(a=!0)}return i?s/i:0}for(let c=0;c<n.length;c++){const u=r.indexOf(c);if(-1===u){const[r,o]=s(c),u=a(c,r,o),l=n[r],p=n[o],f={x:l.x+(p.x-l.x)*u,y:l.y+(p.y-l.y)*u};e.push(f),t[e.length-1]=c,i.push(e.length-1)}else i.push(o[u])}return i}}class T extends E{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POLYGON;for(const t of Object.values(this.shapes))d(this.shapeType,t.points)}}class P extends E{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POLYLINE;for(const t of Object.values(this.shapes))d(this.shapeType,t.points)}}class _ extends E{constructor(t,e,n,r){super(t,e,n,r),this.shapeType=i.POINTS;for(const t of Object.values(this.shapes))d(this.shapeType,t.points)}}A.distance=O.distance,T.distance=j.distance,P.distance=k.distance,_.distance=S.distance,t.exports={RectangleShape:O,PolygonShape:j,PolylineShape:k,PointsShape:S,RectangleTrack:A,PolygonTrack:T,PolylineTrack:P,PointsTrack:_,Track:w,Shape:v,Tag:class extends m{constructor(t,e,n){super(t,e,n)}toJSON(){return{clientID:this.clientID,id:this.serverID,frame:this.frame,label_id:this.label.id,group:this.group,attributes:Object.keys(this.attributes).reduce((t,e)=>(t.push({spec_id:e,value:this.attributes[e]}),t),[])}}get(t){if(t!==this.frame)throw new p("Got frame is not equal to the frame of the shape");return{objectType:s.TAG,clientID:this.clientID,serverID:this.serverID,lock:this.lock,attributes:Object.assign({},this.attributes),label:this.label,group:this.group}}save(t,e){if(t!==this.frame)throw new p("Got frame is not equal to the frame of the shape");if(this.lock&&e.lock)return h.call(this,t,this.get(t));const 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diff --git a/cvat/apps/engine/utils.py b/cvat/apps/engine/utils.py
index a0cedbde..e3b4954d 100644
--- a/cvat/apps/engine/utils.py
+++ b/cvat/apps/engine/utils.py
@@ -48,6 +48,10 @@ def execute_python_code(source_code, global_vars=None, local_vars=None):
         details = err.args[0]
         line_number = err.lineno
         raise InterpreterError("{} at line {}: {}".format(error_class, line_number, details))
+    except AssertionError as err:
+        # AssertionError doesn't contain any args and line number
+        error_class = err.__class__.__name__
+        raise InterpreterError("{}".format(error_class))
     except Exception as err:
         error_class = err.__class__.__name__
         details = err.args[0]