official/projects/yolo/modeling/yolov7_model.py
# Copyright 2024 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""YOLOv7 models."""
from typing import Mapping, Union, Any, Dict
from absl import logging
import tensorflow as tf, tf_keras
from official.projects.yolo.modeling.layers import nn_blocks
class YoloV7(tf_keras.Model):
"""The YOLOv7 model class."""
def __init__(self, backbone, decoder, head, detection_generator, **kwargs):
"""Detection initialization function.
Args:
backbone: `tf_keras.Model` a backbone network.
decoder: `tf_keras.Model` a decoder network.
head: `RetinaNetHead`, the RetinaNet head.
detection_generator: the detection generator.
**kwargs: keyword arguments to be passed.
"""
super().__init__(**kwargs)
self._config_dict = {
'backbone': backbone,
'decoder': decoder,
'head': head,
'detection_generator': detection_generator
}
# model components
self._backbone = backbone
self._decoder = decoder
self._head = head
self._detection_generator = detection_generator
self._fused = False
return
def call(self,
inputs: tf.Tensor,
training: bool = None,
mask: Any = None) -> Dict[str, tf.Tensor]:
backbone_outputs = self.backbone(inputs)
decoder_outputs = self.decoder(backbone_outputs)
raw_outputs = self.head(decoder_outputs)
if training:
return {'raw_output': raw_outputs}
else:
# Post-processing.
predictions = self.detection_generator(raw_outputs)
predictions.update({'raw_output': raw_outputs})
return predictions
@property
def backbone(self):
return self._backbone
@property
def decoder(self):
return self._decoder
@property
def head(self):
return self._head
@property
def detection_generator(self):
return self._detection_generator
def get_config(self):
return self._config_dict
@classmethod
def from_config(cls, config):
return cls(**config)
@property
def checkpoint_items(
self) -> Mapping[str, Union[tf_keras.Model, tf_keras.layers.Layer]]:
"""Returns a dictionary of items to be additionally checkpointed."""
items = dict(backbone=self.backbone, head=self.head)
if self.decoder is not None:
items.update(decoder=self.decoder)
return items
def fuse(self):
"""Performs re-parameterization on ConvBN and RepConv layers."""
logging.info('Fusing ConvBN and RepConv layers.')
if not self._fused:
self._fused = True
for layer in self.submodules:
if isinstance(layer, (nn_blocks.ConvBN, nn_blocks.RepConv)):
layer.fuse()
self.summary()
return