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creator.py
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# Copyright (c) 2016 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.
"""
Creator package contains some simple reader creator, which could
be used in user program.
"""
__all__ = ['np_array', 'text_file', 'recordio']
def np_array(x):
"""
Creates a reader that yields elements of x, if it is a
numpy vector. Or rows of x, if it is a numpy matrix.
Or any sub-hyperplane indexed by the highest dimension.
:param x: the numpy array to create reader from.
:returns: data reader created from x.
"""
def reader():
if x.ndim < 1:
yield x
for e in x:
yield e
return reader
def text_file(path):
"""
Creates a data reader that outputs text line by line from given text file.
Trailing new line ('\\\\n') of each line will be removed.
Args:
path (str): path of the text file.
Returns:
callable: data reader of text file.
"""
def reader():
f = open(path, "r")
for l in f:
yield l.rstrip('\n')
f.close()
return reader
def recordio(paths, buf_size=100):
"""
Creates a data reader from given RecordIO file paths separated
by ",", glob pattern is supported.
Args:
paths (str|list(str)): path of recordio files.
buf_size (int): prefetched buffer size.
Returns:
callable: data reader of recordio files.
"""
import recordio as rec
import paddle.reader.decorator as dec
import six
import six.moves.cPickle as pickle
def reader():
if isinstance(paths, six.string_types):
path = paths
elif isinstance(paths, six.binary_type):
path = paths.decode()
else:
path = ",".join(paths)
f = rec.reader(path)
while True:
r = f.read()
if r is None:
break
yield pickle.loads(r)
f.close()
return dec.buffered(reader, buf_size)