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86 lines
3.2 KiB
86 lines
3.2 KiB
5 years ago
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import torch
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from torch import nn as nn
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try:
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from inplace_abn.functions import inplace_abn, inplace_abn_sync
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has_iabn = True
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except ImportError:
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has_iabn = False
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def inplace_abn(x, weight, bias, running_mean, running_var,
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training=True, momentum=0.1, eps=1e-05, activation="leaky_relu", activation_param=0.01):
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raise ImportError(
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"Please install InplaceABN:'pip install git+https://github.com/mapillary/inplace_abn.git@v1.0.11'")
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def inplace_abn_sync(**kwargs):
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inplace_abn(**kwargs)
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class InplaceAbn(nn.Module):
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"""Activated Batch Normalization
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This gathers a BatchNorm and an activation function in a single module
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Parameters
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----------
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num_features : int
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Number of feature channels in the input and output.
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eps : float
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Small constant to prevent numerical issues.
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momentum : float
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Momentum factor applied to compute running statistics.
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affine : bool
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If `True` apply learned scale and shift transformation after normalization.
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act_layer : str or nn.Module type
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Name or type of the activation functions, one of: `leaky_relu`, `elu`
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act_param : float
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Negative slope for the `leaky_relu` activation.
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"""
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def __init__(self, num_features, eps=1e-5, momentum=0.1, affine=True, apply_act=True,
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act_layer="leaky_relu", act_param=0.01, drop_block=None,):
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super(InplaceAbn, self).__init__()
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self.num_features = num_features
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self.affine = affine
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self.eps = eps
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self.momentum = momentum
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if apply_act:
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if isinstance(act_layer, str):
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assert act_layer in ('leaky_relu', 'elu', 'identity')
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self.act_name = act_layer
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else:
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# convert act layer passed as type to string
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if isinstance(act_layer, nn.ELU):
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self.act_name = 'elu'
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elif isinstance(act_layer, nn.LeakyReLU):
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self.act_name = 'leaky_relu'
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else:
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assert False, f'Invalid act layer {act_layer.__name__} for IABN'
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else:
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self.act_name = 'identity'
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self.act_param = act_param
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if self.affine:
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self.weight = nn.Parameter(torch.ones(num_features))
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self.bias = nn.Parameter(torch.zeros(num_features))
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else:
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self.register_parameter('weight', None)
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self.register_parameter('bias', None)
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self.register_buffer('running_mean', torch.zeros(num_features))
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self.register_buffer('running_var', torch.ones(num_features))
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self.reset_parameters()
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def reset_parameters(self):
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nn.init.constant_(self.running_mean, 0)
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nn.init.constant_(self.running_var, 1)
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if self.affine:
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nn.init.constant_(self.weight, 1)
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nn.init.constant_(self.bias, 0)
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def forward(self, x):
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output = inplace_abn(
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x, self.weight, self.bias, self.running_mean, self.running_var,
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self.training, self.momentum, self.eps, self.act_name, self.act_param)
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if isinstance(output, tuple):
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output = output[0]
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return output
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