def __init__(self, blocks_args=None, global_params=None):
super().__init__()
assert isinstance(blocks_args, list), 'blocks_args should be a list'
assert len(blocks_args) > 0, 'block args must be greater than 0'
self._global_params = global_params
self._blocks_args = blocks_args
# Batch norm parameters
bn_mom = 1 - self._global_params.batch_norm_momentum
bn_eps = self._global_params.batch_norm_epsilon
# Get stem static or dynamic convolution depending on image size
image_size = global_params.image_size
Conv2d = get_same_padding_conv2d(image_size=image_size)
# Stem
in_channels = 3 # rgb
out_channels = round_filters(32, self._global_params) # number of output channels
self._conv_stem = Conv2d(in_channels, out_channels, kernel_size=3, stride=2, bias=False)
self._bn0 = nn.BatchNorm2d(num_features=out_channels, momentum=bn_mom, eps=bn_eps)
image_size = calculate_output_image_size(image_size, 2)
# Build blocks
self._blocks = nn.ModuleList([])
for block_args in self._blocks_args:
# Update block input and output filters based on depth multiplier.
block_args = block_args._replace(
input_filters=round_filters(block_args.input_filters, self._global_params),
output_filters=round_filters(block_args.output_filters, self._global_params),
num_repeat=round_repeats(block_args.num_repeat, self._global_params)
)
# The first block needs to take care of stride and filter size increase.
self._blocks.append(MBConvBlock(block_args, self._global_params, image_size=image_size))
image_size = calculate_output_image_size(image_size, block_args.stride)
if block_args.num_repeat > 1: # modify block_args to keep same output size
block_args = block_args._replace(input_filters=block_args.output_filters, stride=1)
for _ in range(block_args.num_repeat - 1):
self._blocks.append(MBConvBlock(block_args, self._global_params, image_size=image_size))
# image_size = calculate_output_image_size(image_size, block_args.stride) # stride = 1
# Head
in_channels = block_args.output_filters # output of final block
out_channels = round_filters(1280, self._global_params)
Conv2d = get_same_padding_conv2d(image_size=image_size)
self._conv_head = Conv2d(in_channels, out_channels, kernel_size=1, bias=False)
self._bn1 = nn.BatchNorm2d(num_features=out_channels, momentum=bn_mom, eps=bn_eps)
# Final linear layer
self._avg_pooling = nn.AdaptiveAvgPool2d(1)
self._dropout = nn.Dropout(self._global_params.dropout_rate)
self._fc = nn.Linear(out_channels, self._global_params.num_classes)
self._swish = MemoryEfficientSwish()
def __init__(self, block_args, global_params):
super().__init__()
self._block_args = block_args
self._bn_mom = 1 - global_params.batch_norm_momentum
self._bn_eps = global_params.batch_norm_epsilon
self.has_se = (self._block_args.se_ratio
is not None) and (0 < self._block_args.se_ratio <= 1)
self.id_skip = block_args.id_skip # skip connection and drop connect
# Get static or dynamic convolution depending on image size
Conv2d = get_same_padding_conv2d(image_size=global_params.image_size)
# Expansion phase
inp = self._block_args.input_filters # number of input channels
oup = self._block_args.input_filters * self._block_args.expand_ratio # number of output channels
if self._block_args.expand_ratio != 1:
self._expand_conv = Conv2d(in_channels=inp,
out_channels=oup,
kernel_size=1,
bias=False)
self._bn0 = nn.BatchNorm2d(num_features=oup,
momentum=self._bn_mom,
eps=self._bn_eps)
# Depthwise convolution phase
k = self._block_args.kernel_size
s = self._block_args.stride
self._depthwise_conv = Conv2d(
in_channels=oup,
out_channels=oup,
groups=oup, # groups makes it depthwise
kernel_size=k,
stride=s,
bias=False)
self._bn1 = nn.BatchNorm2d(num_features=oup,
momentum=self._bn_mom,
eps=self._bn_eps)
# Squeeze and Excitation layer, if desired
if self.has_se:
num_squeezed_channels = max(
1,
int(self._block_args.input_filters *
self._block_args.se_ratio))
self._se_reduce = Conv2d(in_channels=oup,
out_channels=num_squeezed_channels,
kernel_size=1)
self._se_expand = Conv2d(in_channels=num_squeezed_channels,
out_channels=oup,
kernel_size=1)
# Output phase
final_oup = self._block_args.output_filters
self._project_conv = Conv2d(in_channels=oup,
out_channels=final_oup,
kernel_size=1,
bias=False)
self._bn2 = nn.BatchNorm2d(num_features=final_oup,
momentum=self._bn_mom,
eps=self._bn_eps)
def _change_in_channels(self, in_channels):
"""Adjust model's first convolution layer to in_channels, if in_channels not equals 3.
Args:
in_channels (int): Input data's channel number.
"""
if in_channels != 3:
Conv2d = get_same_padding_conv2d(image_size = self._global_params.image_size)
out_channels = round_filters(32, self._global_params)
self._conv_stem = Conv2d(in_channels, out_channels, kernel_size=3, stride=2, bias=False)
def __init__(self, block_args, global_params, image_size=None):
super().__init__()
self._block_args = block_args
self._bn_mom = 1 - global_params.batch_norm_momentum # pytorch's difference from tensorflow
self._bn_eps = global_params.batch_norm_epsilon
self.has_se = (self._block_args.se_ratio is not None) and (0 < self._block_args.se_ratio <= 1)
self.id_skip = block_args.id_skip # whether to use skip connection and drop connect
# Expansion phase (Inverted Bottleneck)
inp = self._block_args.input_filters # number of input channels
oup = self._block_args.input_filters * self._block_args.expand_ratio # number of output channels
if self._block_args.expand_ratio != 1:
Conv2d = get_same_padding_conv2d(image_size=image_size)
self._expand_conv = Conv2d(in_channels=inp, out_channels=oup, kernel_size=1, bias=False)
self._bn0 = nn.BatchNorm2d(num_features=oup, momentum=self._bn_mom, eps=self._bn_eps)
# image_size = calculate_output_image_size(image_size, 1) <-- this wouldn't modify image_size
# Depthwise convolution phase
k = self._block_args.kernel_size
s = self._block_args.stride
Conv2d = get_same_padding_conv2d(image_size=image_size)
self._depthwise_conv = Conv2d(
in_channels=oup, out_channels=oup, groups=oup, # groups makes it depthwise
kernel_size=k, stride=s, bias=False)
self._bn1 = nn.BatchNorm2d(num_features=oup, momentum=self._bn_mom, eps=self._bn_eps)
image_size = calculate_output_image_size(image_size, s)
# Squeeze and Excitation layer, if desired
if self.has_se:
Conv2d = get_same_padding_conv2d(image_size=(1,1))
num_squeezed_channels = max(1, int(self._block_args.input_filters * self._block_args.se_ratio))
self._se_reduce = Conv2d(in_channels=oup, out_channels=num_squeezed_channels, kernel_size=1)
self._se_expand = Conv2d(in_channels=num_squeezed_channels, out_channels=oup, kernel_size=1)
# Pointwise convolution phase
final_oup = self._block_args.output_filters
Conv2d = get_same_padding_conv2d(image_size=image_size)
self._project_conv = Conv2d(in_channels=oup, out_channels=final_oup, kernel_size=1, bias=False)
self._bn2 = nn.BatchNorm2d(num_features=final_oup, momentum=self._bn_mom, eps=self._bn_eps)
self._swish = MemoryEfficientSwish()
def from_pretrained(cls, model_name, num_classes=1000, in_channels=3):
model = cls.from_name(model_name,
override_params={'num_classes': num_classes})
load_pretrained_weights(model,
model_name,
load_fc=(num_classes == 1000))
if in_channels != 3:
Conv2d = get_same_padding_conv2d(
image_size=model._global_params.image_size)
out_channels = round_filters(32, model._global_params)
model._conv_stem = Conv2d(in_channels,
out_channels,
kernel_size=3,
stride=2,
bias=False)
return model
def __init__(self,
blocks_args=None,
global_params=None,
ds_low=None,
ds_high=None):
super().__init__()
assert isinstance(blocks_args, list), 'blocks_args should be a list'
assert len(blocks_args) > 0, 'block args must be greater than 0'
assert ds_high > ds_low, 'ds_high must be greater than ds_low'
assert max(
ds_high,
ds_low) <= 32, 'downsampling time should not be greater than 32'
self._global_params = global_params
self._blocks_args = blocks_args
self.ds_low = ds_low
self.ds_high = ds_high
# Get static or dynamic convolution depending on image size
Conv2d = get_same_padding_conv2d(image_size=global_params.image_size)
# Batch norm parameters
bn_mom = 1 - self._global_params.batch_norm_momentum
bn_eps = self._global_params.batch_norm_epsilon
# Stem
in_channels = 3 # rgb
out_channels = round_filters(
32, self._global_params) # number of output channels
self._conv_stem = Conv2d(in_channels,
out_channels,
kernel_size=3,
stride=2,
bias=False)
self._bn0 = nn.BatchNorm2d(num_features=out_channels,
momentum=bn_mom,
eps=bn_eps)
# Build blocks
self._blocks = nn.ModuleList([])
# Calculate the number of blocks
block_indexs = [0, 1, 2, 4, 5, 6]
if ds_high == None:
self.num_blocks = 7
else:
self.num_blocks = round(math.log(self.ds_high, 2))
for block_args in self._blocks_args[0:block_indexs[self.num_blocks]]:
# Update block input and output filters based on depth multiplier.
block_args = block_args._replace(
input_filters=round_filters(block_args.input_filters,
self._global_params),
output_filters=round_filters(block_args.output_filters,
self._global_params),
num_repeat=round_repeats(block_args.num_repeat,
self._global_params))
# The first block needs to take care of stride and filter size increase.
self._blocks.append(MBConvBlock(block_args, self._global_params))
if block_args.num_repeat > 1:
block_args = block_args._replace(
input_filters=block_args.output_filters, stride=1)
for _ in range(block_args.num_repeat - 1):
self._blocks.append(
MBConvBlock(block_args, self._global_params))
# Head
in_channels = block_args.output_filters # output of final block
out_channels = round_filters(1280, self._global_params)
#self._conv_head = Conv2d(in_channels, out_channels, kernel_size=1, bias=False)
#self._bn1 = nn.BatchNorm2d(num_features=out_channels, momentum=bn_mom, eps=bn_eps)
# Final linear layer
#self._avg_pooling = nn.AdaptiveAvgPool2d(1)
#self._dropout = nn.Dropout(self._global_params.dropout_rate)
#self._fc = nn.Linear(out_channels, self._global_params.num_classes)
self._swish = MemoryEfficientSwish()
def __init__(self,
blocks_args=None,
global_params=None,
norm='',
model_version=4):
super().__init__()
assert isinstance(blocks_args, list), 'blocks_args should be a list'
assert len(blocks_args) > 0, 'block args must be greater than 0'
self.g_cfg = global_params
self.b_cfgs = blocks_args
# Get static or dynamic convolution depending on image size
Conv2d = get_same_padding_conv2d(image_size=global_params.image_size)
# Batch norm parameters
bn_mom = 1 - self.g_cfg.batch_norm_momentum
bn_eps = self.g_cfg.batch_norm_epsilon
# Stem
in_channels = 3 # rgb
out_channels = round_filters(32,
self.g_cfg) # number of output channels
self._conv_stem = Conv2d(in_channels,
out_channels,
kernel_size=3,
stride=2,
bias=False)
# self._bn0 = nn.BatchNorm2d(num_features=out_channels, momentum=bn_mom, eps=bn_eps)
self._bn0 = get_norm(norm, out_channels)
# Build blocks
self._blocks = nn.ModuleList([])
idx = 0
out_inds = []
out_channels = []
for b_cfg in self.b_cfgs:
# Update block input and output filters based on depth multiplier.
b_cfg = b_cfg._replace(
input_filters=round_filters(b_cfg.input_filters, self.g_cfg),
output_filters=round_filters(b_cfg.output_filters, self.g_cfg),
num_repeat=round_repeats(b_cfg.num_repeat, self.g_cfg))
# The first block needs to take care of stride and filter size increase.
self._blocks.append(MBConvBlock(b_cfg, self.g_cfg, norm))
print(b_cfg.stride)
if b_cfg.stride[0] != 1:
out_inds.append(idx - 1)
out_channels.append(b_cfg.input_filters)
idx += 1
if b_cfg.num_repeat > 1:
b_cfg = b_cfg._replace(input_filters=b_cfg.output_filters,
stride=1)
for _ in range(b_cfg.num_repeat - 1):
self._blocks.append(MBConvBlock(b_cfg, self.g_cfg, norm))
idx += 1
out_inds.append(idx - 1)
out_channels.append(b_cfg.output_filters)
self.out_block_inds_all_stage = out_inds
self.out_block_inds = out_inds[1:]
self._out_feature_channels = out_channels[1:]
# Head
# in_channels = block_args.output_filters # output of final block
# out_channels = round_filters(1280, self._global_params)
# self._conv_head = Conv2d(in_channels, out_channels, kernel_size=1, bias=False)
# self._bn1 = nn.BatchNorm2d(num_features=out_channels, momentum=bn_mom, eps=bn_eps)
#
# # Final linear layer
# self._avg_pooling = nn.AdaptiveAvgPool2d(1)
# self._dropout = nn.Dropout(self._global_params.dropout_rate)
# self._fc = nn.Linear(out_channels, self._global_params.num_classes)
self._swish = MemoryEfficientSwish()
