kopia lustrzana https://github.com/lzzcd001/MeshDiffusion
223 wiersze
7.9 KiB
Python
223 wiersze
7.9 KiB
Python
# coding=utf-8
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# Copyright 2020 The Google Research Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Normalization layers."""
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import torch.nn as nn
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import torch
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import functools
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def get_normalization(config, conditional=False):
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"""Obtain normalization modules from the config file."""
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norm = config.model.normalization
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if conditional:
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if norm == 'InstanceNorm++':
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return functools.partial(ConditionalInstanceNorm3dPlus, num_classes=config.model.num_classes)
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else:
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raise NotImplementedError(f'{norm} not implemented yet.')
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else:
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if norm == 'InstanceNorm':
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return nn.InstanceNorm3d
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elif norm == 'InstanceNorm++':
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return InstanceNorm3dPlus
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elif norm == 'VarianceNorm':
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return VarianceNorm3d
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elif norm == 'GroupNorm':
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return nn.GroupNorm
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else:
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raise ValueError('Unknown normalization: %s' % norm)
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class ConditionalBatchNorm3d(nn.Module):
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def __init__(self, num_features, num_classes, bias=True):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.bn = nn.BatchNorm3d(num_features, affine=False)
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if self.bias:
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self.embed = nn.Embedding(num_classes, num_features * 2)
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self.embed.weight.data[:, :num_features].uniform_() # Initialise scale at N(1, 0.02)
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self.embed.weight.data[:, num_features:].zero_() # Initialise bias at 0
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else:
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self.embed = nn.Embedding(num_classes, num_features)
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self.embed.weight.data.uniform_()
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def forward(self, x, y):
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out = self.bn(x)
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if self.bias:
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gamma, beta = self.embed(y).chunk(2, dim=1)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * out + beta.view(-1, self.num_features, 1, 1, 1)
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else:
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gamma = self.embed(y)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * out
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return out
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class ConditionalInstanceNorm3d(nn.Module):
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def __init__(self, num_features, num_classes, bias=True):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.instance_norm = nn.InstanceNorm3d(num_features, affine=False, track_running_stats=False)
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if bias:
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self.embed = nn.Embedding(num_classes, num_features * 2)
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self.embed.weight.data[:, :num_features].uniform_() # Initialise scale at N(1, 0.02)
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self.embed.weight.data[:, num_features:].zero_() # Initialise bias at 0
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else:
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self.embed = nn.Embedding(num_classes, num_features)
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self.embed.weight.data.uniform_()
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def forward(self, x, y):
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h = self.instance_norm(x)
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if self.bias:
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gamma, beta = self.embed(y).chunk(2, dim=-1)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * h + beta.view(-1, self.num_features, 1, 1, 1)
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else:
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gamma = self.embed(y)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * h
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return out
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class ConditionalVarianceNorm3d(nn.Module):
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def __init__(self, num_features, num_classes, bias=False):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.embed = nn.Embedding(num_classes, num_features)
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self.embed.weight.data.normal_(1, 0.02)
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def forward(self, x, y):
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vars = torch.var(x, dim=(2, 3, 4), keepdim=True)
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h = x / torch.sqrt(vars + 1e-5)
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gamma = self.embed(y)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * h
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return out
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class VarianceNorm3d(nn.Module):
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def __init__(self, num_features, bias=False):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.alpha = nn.Parameter(torch.zeros(num_features))
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self.alpha.data.normal_(1, 0.02)
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def forward(self, x):
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vars = torch.var(x, dim=(2, 3, 4), keepdim=True)
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h = x / torch.sqrt(vars + 1e-5)
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out = self.alpha.view(-1, self.num_features, 1, 1, 1) * h
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return out
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class ConditionalNoneNorm3d(nn.Module):
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def __init__(self, num_features, num_classes, bias=True):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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if bias:
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self.embed = nn.Embedding(num_classes, num_features * 2)
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self.embed.weight.data[:, :num_features].uniform_() # Initialise scale at N(1, 0.02)
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self.embed.weight.data[:, num_features:].zero_() # Initialise bias at 0
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else:
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self.embed = nn.Embedding(num_classes, num_features)
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self.embed.weight.data.uniform_()
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def forward(self, x, y):
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if self.bias:
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gamma, beta = self.embed(y).chunk(2, dim=-1)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * x + beta.view(-1, self.num_features, 1, 1, 1)
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else:
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gamma = self.embed(y)
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out = gamma.view(-1, self.num_features, 1, 1, 1) * x
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return out
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class NoneNorm3d(nn.Module):
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def __init__(self, num_features, bias=True):
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super().__init__()
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def forward(self, x):
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return x
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class InstanceNorm3dPlus(nn.Module):
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def __init__(self, num_features, bias=True):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.instance_norm = nn.InstanceNorm3d(num_features, affine=False, track_running_stats=False)
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self.alpha = nn.Parameter(torch.zeros(num_features))
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self.gamma = nn.Parameter(torch.zeros(num_features))
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self.alpha.data.normal_(1, 0.02)
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self.gamma.data.normal_(1, 0.02)
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if bias:
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self.beta = nn.Parameter(torch.zeros(num_features))
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def forward(self, x):
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means = torch.mean(x, dim=(2, 3, 4))
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m = torch.mean(means, dim=-1, keepdim=True)
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v = torch.var(means, dim=-1, keepdim=True)
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means = (means - m) / (torch.sqrt(v + 1e-5))
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h = self.instance_norm(x)
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if self.bias:
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h = h + means[..., None, None, None] * self.alpha[..., None, None, None]
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out = self.gamma.view(-1, self.num_features, 1, 1, 1) * h + self.beta.view(-1, self.num_features, 1, 1, 1)
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else:
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h = h + means[..., None, None, None] * self.alpha[..., None, None, None]
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out = self.gamma.view(-1, self.num_features, 1, 1, 1) * h
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return out
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class ConditionalInstanceNorm3dPlus(nn.Module):
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def __init__(self, num_features, num_classes, bias=True):
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super().__init__()
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self.num_features = num_features
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self.bias = bias
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self.instance_norm = nn.InstanceNorm3d(num_features, affine=False, track_running_stats=False)
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if bias:
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self.embed = nn.Embedding(num_classes, num_features * 3)
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self.embed.weight.data[:, :2 * num_features].normal_(1, 0.02) # Initialise scale at N(1, 0.02)
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self.embed.weight.data[:, 2 * num_features:].zero_() # Initialise bias at 0
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else:
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self.embed = nn.Embedding(num_classes, 2 * num_features)
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self.embed.weight.data.normal_(1, 0.02)
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def forward(self, x, y):
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means = torch.mean(x, dim=(2, 3, 4))
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m = torch.mean(means, dim=-1, keepdim=True)
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v = torch.var(means, dim=-1, keepdim=True)
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means = (means - m) / (torch.sqrt(v + 1e-5))
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h = self.instance_norm(x)
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if self.bias:
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gamma, alpha, beta = self.embed(y).chunk(3, dim=-1)
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h = h + means[..., None, None, None] * alpha[..., None, None, None]
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out = gamma.view(-1, self.num_features, 1, 1, 1) * h + beta.view(-1, self.num_features, 1, 1, 1)
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else:
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gamma, alpha = self.embed(y).chunk(2, dim=-1)
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h = h + means[..., None, None, None] * alpha[..., None, None, None]
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out = gamma.view(-1, self.num_features, 1, 1, 1) * h
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return out
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def lip_weight_normalization_3d(W, softplus_c):
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"""
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Lipschitz weight normalization based on the L-infinity norm (see Eq.9 in [Liu et al 2022])
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"""
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absrowsum = torch.sum(torch.abs(W), dim=[1,2,3,4]) + 1e-8
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scale = torch.nn.functional.relu(softplus_c/absrowsum - 1.0) + 1.0
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return W * scale[:, None, None, None, None] |