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.
36 lines
1.1 KiB
36 lines
1.1 KiB
# Copyright (c) 2021 PaddlePaddle Authors. 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.
|
|
|
|
import logging
|
|
|
|
import paddle
|
|
from paddle import nn
|
|
from paddle.nn import functional as F
|
|
from paddle.nn import initializer as I
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
__all__ = ['sequence_mask']
|
|
|
|
|
|
def sequence_mask(x_len, max_len=None, dtype='float32'):
|
|
max_len = max_len or x_len.max()
|
|
x_len = paddle.unsqueeze(x_len, -1)
|
|
row_vector = paddle.arange(max_len)
|
|
# TODO(Hui Zhang): fix this bug
|
|
#mask = row_vector < x_len
|
|
mask = row_vector > x_len # a bug, broadcast 的时候出错了
|
|
mask = paddle.cast(mask, dtype)
|
|
return mask
|