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# Copyright (c) OpenMMLab. All rights reserved.
import logging
from abc import ABCMeta, abstractmethod
import torch.nn as nn
# from .utils import load_checkpoint
from mmcv_custom.checkpoint import load_checkpoint
class BaseBackbone(nn.Module, metaclass=ABCMeta):
"""Base backbone.
This class defines the basic functions of a backbone. Any backbone that
inherits this class should at least define its own `forward` function.
"""
def init_weights(self, pretrained=None, patch_padding='pad', part_features=None):
"""Init backbone weights.
Args:
pretrained (str | None): If pretrained is a string, then it
initializes backbone weights by loading the pretrained
checkpoint. If pretrained is None, then it follows default
initializer or customized initializer in subclasses.
"""
if isinstance(pretrained, str):
logger = logging.getLogger()
load_checkpoint(self, pretrained, strict=False, logger=logger, patch_padding=patch_padding, part_features=part_features)
elif pretrained is None:
# use default initializer or customized initializer in subclasses
pass
else:
raise TypeError('pretrained must be a str or None.'
f' But received {type(pretrained)}.')
@abstractmethod
def forward(self, x):
"""Forward function.
Args:
x (Tensor | tuple[Tensor]): x could be a torch.Tensor or a tuple of
torch.Tensor, containing input data for forward computation.
"""
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