You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.9 KiB
61 lines
1.9 KiB
# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
|
|
# Copyright 2019 Mobvoi Inc. All Rights Reserved.
|
|
#
|
|
# 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.
|
|
# Modified from wenet(https://github.com/wenet-e2e/wenet)
|
|
import paddle
|
|
from paddle import nn
|
|
|
|
from paddlespeech.s2t.utils.log import Log
|
|
|
|
logger = Log(__name__).getlog()
|
|
|
|
__all__ = ['GlobalCMVN']
|
|
|
|
|
|
class GlobalCMVN(nn.Layer):
|
|
def __init__(self,
|
|
mean: paddle.Tensor,
|
|
istd: paddle.Tensor,
|
|
norm_var: bool=True):
|
|
"""
|
|
Args:
|
|
mean (paddle.Tensor): mean stats
|
|
istd (paddle.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 __repr__(self):
|
|
return ("{name}(mean={mean}, istd={istd}, norm_var={norm_var})".format(
|
|
name=self.__class__.__name__,
|
|
mean=self.mean,
|
|
istd=self.istd,
|
|
norm_var=self.norm_var))
|
|
|
|
def forward(self, x: paddle.Tensor):
|
|
"""
|
|
Args:
|
|
x (paddle.Tensor): (batch, max_len, feat_dim)
|
|
Returns:
|
|
(paddle.Tensor): normalized feature
|
|
"""
|
|
x = x - self.mean
|
|
if self.norm_var:
|
|
x = x * self.istd
|
|
return x
|