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"""For reading and writing TFRecords files."""
from tensorflow.python import pywrap_tensorflow
def tf_record_iterator(path):
"""An iterator that read the records from a TFRecords file.
Args:
path: The path to the TFRecords file.
Yields:
Strings.
Raises:
IOError: If `path` cannot be opened for reading.
"""
reader = pywrap_tensorflow.PyRecordReader_New(path, 0)
if reader is None:
raise IOError("Could not open %s." % path)
while reader.GetNext():
yield reader.record()
reader.Close()
class TFRecordWriter(object):
"""A class to write records to a TFRecords file.
This class implements `__enter__` and `__exit__`, and can be used
in `with` blocks like a normal file.
@@__init__
@@write
@@close
"""
# TODO(josh11b): Support appending?
def __init__(self, path):
"""Opens file `path` and creates a `TFRecordWriter` writing to it.
Args:
path: The path to the TFRecords file.
Raises:
IOError: If `path` cannot be opened for writing.
"""
self._writer = pywrap_tensorflow.PyRecordWriter_New(path)
if self._writer is None:
raise IOError("Could not write to %s." % path)
def __enter__(self):
"""Enter a `with` block."""
pass
def __exit__(self, unused_type, unused_value, unused_traceback):
"""Exit a `with` block, closing the file."""
self.close()
def write(self, record):
"""Write a string record to the file.
Args:
record: str
"""
self._writer.WriteRecord(record)
def close(self):
"""Close the file."""
self._writer.Close()
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