[MO] [TF] Added TF broadcast_to extractor (#4376)

* Added TF broadcast_to extractor

* updated Supported_Frameworks_Layers.md

* corrected name

* corrected op name in Supported_Frameworks_Layers.md

* added a space after BroadcastTo in Supported_Frameworks_Layers.md

docs/MO_DG/prepare_model/Supported_Frameworks_Layers.md

@@ -134,6 +134,7 @@ Standard TensorFlow\* operations:
 | BatchToSpaceND | No |
 | BiasAdd | No |
 | Bucketize | CPU only |
+| BroadcastTo | No |
 | Cast | No |
 | Ceil | No |
 | Concat | No |

model-optimizer/automation/package_BOM.txt

@@ -370,6 +370,7 @@ extensions/front/tf/BatchMatMul_ext.py
 extensions/front/tf/BatchToSpaceNDToUpsample.py
 extensions/front/tf/BlockLSTM.py
 extensions/front/tf/BlockLSTM_ext.py
+extensions/front/tf/broadcast_ext.py
 extensions/front/tf/bucketize.py
 extensions/front/tf/bucketize_ext.py
 extensions/front/tf/Cast_ext.py

model-optimizer/extensions/front/tf/broadcast_ext.py

@@ -0,0 +1,29 @@
+"""
+ Copyright (C) 2018-2021 Intel Corporation
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+"""
+
+from mo.front.extractor import FrontExtractorOp
+from mo.graph.graph import Node
+from mo.ops.broadcast import Broadcast
+
+
+class BroadcastExtractor(FrontExtractorOp):
+    op = 'BroadcastTo'
+    enabled = True
+
+    @classmethod
+    def extract(cls, node: Node):
+        Broadcast.update_node_stat(node, attrs={'mode': 'numpy'})
+        return cls.enabled