model-optimizer/extensions/front/mxnet/ssd_pattern_remove_transpose.py

   1 """
   2  Copyright (c) 2017-2019 Intel Corporation
   3
   4  Licensed under the Apache License, Version 2.0 (the "License");
   5  you may not use this file except in compliance with the License.
   6  You may obtain a copy of the License at
   7
   8       http://www.apache.org/licenses/LICENSE-2.0
   9
  10  Unless required by applicable law or agreed to in writing, software
  11  distributed under the License is distributed on an "AS IS" BASIS,
  12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  See the License for the specific language governing permissions and
  14  limitations under the License.
  15 """
  16
  17 import networkx as nx
  18
  19 from extensions.front.mxnet.ssd_pattern_flatten_softmax_activation import SsdPatternFlattenSoftmaxActivation
  20 from extensions.front.mxnet.ssd_pattern_remove_flatten import SsdPatternRemoveFlatten
  21 from extensions.front.mxnet.ssd_pattern_remove_reshape import SsdPatternRemoveReshape
  22 from mo.front.common.replacement import FrontReplacementSubgraph
  23 from mo.graph.graph import Graph
  24
  25
  26 class SsdPatternRemoveTranspose(FrontReplacementSubgraph):
  27     enabled = True
  28
  29     def run_before(self):
  30         return [SsdPatternFlattenSoftmaxActivation, SsdPatternRemoveFlatten, SsdPatternRemoveReshape]
  31
  32     def pattern(self):
  33         return dict(
  34             nodes=[
  35                 ('transpose', dict(op='transpose')),
  36                 ('softmax_activation', dict(op='SoftMax')),
  37                 ('multi_box_detection', dict(op='_contrib_MultiBoxDetection'))
  38             ],
  39             edges=[
  40                 ('transpose', 'softmax_activation', {'in': 0}),
  41                 ('softmax_activation', 'multi_box_detection', {'in': 1}),
  42             ]
  43         )
  44
  45     def replace_sub_graph(self, graph: Graph, match: dict):
  46         """
  47         Need to find each occurrence of pattern:
  48         transpose -> SoftmaxActivation -> _contrib_MultiBoxDetection
  49         remove transpose layer to secure the order of weights in SoftMax to be the same as IE expects
  50         IE expects weights to be in following order: class-wise values for each priorbox.
  51         priorboxes change the quickest
  52
  53         Parameters
  54         ----------
  55         graph : Graph
  56            Graph with loaded model.
  57          match : dict
  58            Patterns which were found in graph structure.
  59         """
  60         transpose_node = match['transpose']
  61         softmax_activation = match['softmax_activation']
  62         transpose_in_node = transpose_node.in_node(0)
  63
  64         graph.remove_edge(transpose_in_node.id, transpose_node.id)
  65         graph.remove_edge(transpose_node.id, softmax_activation.id)
  66         graph.remove_node(transpose_node.id)
  67         graph.create_edge(transpose_in_node, softmax_activation)