49 lines
2.0 KiB
Python
49 lines
2.0 KiB
Python
# Copyright (C) 2018-2021 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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import numpy as np
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from extensions.ops.elementwise import Mul, Pow
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from mo.front.common.replacement import FrontReplacementPattern
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from mo.front.tf.graph_utils import create_op_with_const_inputs
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from mo.graph.graph import Graph, Node, rename_node
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class Div(FrontReplacementPattern):
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# This transformation is called directly from the 'model-optimizer/extensions/middle/fusings.py' transformation
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enabled = False
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@staticmethod
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def div_to_mul_replacement(div: Node):
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# we execute this transformation for V10 IR later on middle phase despite graph_condition
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# so we prevent Div replacement on shape-calculating sub-graphs
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if div.in_port(0).data.get_value() is not None and div.in_port(1).data.get_value() is not None:
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return
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# cannot replace Div with Mul when the divisor is integer because the reciprocal number will be 0
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value = div.in_port(1).data.get_value()
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if value is not None and type(value.item(0)) == int:
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return
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graph = div.graph
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name = div.soft_get('name', div.id)
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# keep Mul name the same as Div -- because of mathematical equality of output tensors
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rename_node(node=div, name=name + '/to_be_removed')
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# reconnect Div in(out)puts to Mul
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mul = Mul(graph, {'name': name}).create_node()
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rename_node(mul, name)
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div.in_port(0).get_connection().set_destination(mul.in_port(0))
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div.in_port(1).get_connection().set_destination(mul.in_port(1))
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div.out_port(0).get_connection().set_source(mul.out_port(0))
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# restore mathematical equivalence to Div operation: Div(A, B) = Mul(A, Pow(B, -1))
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reciprocal = create_op_with_const_inputs(graph, Pow, {1: np.float64(-1)}, {'name': name + '/reciprocal_'})
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mul.in_port(1).get_connection().insert_node(reciprocal)
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def find_and_replace_pattern(self, graph: Graph):
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for div in graph.get_op_nodes(op='Div'):
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self.div_to_mul_replacement(div)
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