Fixed tensorflow annotation without OpenVINO (#359)

cvat/apps/tf_annotation/views.py

@@ -8,7 +8,6 @@ from django.core.exceptions import ObjectDoesNotExist
 from django.shortcuts import render
 from rules.contrib.views import permission_required, objectgetter
 from cvat.apps.authentication.decorators import login_required
-from cvat.apps.auto_annotation.inference_engine import make_plugin, make_network
 from cvat.apps.engine.models import Task as TaskModel
 from cvat.apps.engine import annotation, task
 
@@ -33,6 +32,8 @@ def load_image_into_numpy(image):
 
 
 def run_inference_engine_annotation(image_list, labels_mapping, treshold):
+    from cvat.apps.auto_annotation.inference_engine import make_plugin, make_network
+
     def _normalize_box(box, w, h, dw, dh):
         xmin = min(int(box[0] * dw * w), w)
         ymin = min(int(box[1] * dh * h), h)