#!/usr/bin/env python
# ******************************************************************************
# Copyright 2023 Brainchip Holdings Ltd.
#
# 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
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# Unless required by applicable law or agreed to in writing, software
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"""
ReLU > MaxPool inversion helper.
"""
__all__ = ["invert_relu_maxpool"]
from keras.layers import MaxPool2D, ReLU
from .transforms_utils import find_layers_pairs, invert_layer_pairs
[docs]def invert_relu_maxpool(model):
""" Inverts ReLU and MaxPool2D layers in a model to have MaxPool2D before ReLU.
This transformation produces a strictly equivalent model.
Args:
model (keras.Model): a model
Returns:
keras.Model: keras.Model: the original model or the updated model
"""
# Find ReLU followed by MaxPool2D layer pairs that are candidates for inversion
map_relu_mp = find_layers_pairs(model, ReLU, MaxPool2D)
# When there are no valid candidates, return the original model
if not map_relu_mp:
return model
# Rebuild a model with MP and ReLU inverted by editing the configuration
return invert_layer_pairs(model, map_relu_mp)