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| # Copyright (c) 2020 Mobvoi Inc (Binbin Zhang) | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| import torch | |
| class GlobalCMVN(torch.nn.Module): | |
| def __init__(self, | |
| mean: torch.Tensor, | |
| istd: torch.Tensor, | |
| norm_var: bool = True): | |
| """ | |
| Args: | |
| mean (torch.Tensor): mean stats | |
| istd (torch.Tensor): inverse std, std which is 1.0 / std | |
| """ | |
| super().__init__() | |
| assert mean.shape == istd.shape | |
| self.norm_var = norm_var | |
| # The buffer can be accessed from this module using self.mean | |
| self.register_buffer("mean", mean) | |
| self.register_buffer("istd", istd) | |
| def forward(self, x: torch.Tensor): | |
| """ | |
| Args: | |
| x (torch.Tensor): (batch, max_len, feat_dim) | |
| Returns: | |
| (torch.Tensor): normalized feature | |
| """ | |
| x = x - self.mean | |
| if self.norm_var: | |
| x = x * self.istd | |
| return x | |