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Describe that the semantics of gfile are different. #20847

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Jul 18, 2018
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Describe that the semantics of gfile are different. #20847

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18 changes: 16 additions & 2 deletions tensorflow/python/platform/gfile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,15 +38,29 @@

@tf_export('gfile.GFile', 'gfile.Open')
class GFile(_FileIO):
"""File I/O wrappers without thread locking."""
"""File I/O wrappers without thread locking.

Note, that this is somewhat like builtin Python file I/O, but
there are semantic differences to make it more efficient for
some backing filesystems. For example, a write mode file will
not be opened until the first write call (to minimize RPC
invocations in network filesystems).
"""

def __init__(self, name, mode='r'):
super(GFile, self).__init__(name=name, mode=mode)


@tf_export('gfile.FastGFile')
class FastGFile(_FileIO):
"""File I/O wrappers without thread locking."""
"""File I/O wrappers without thread locking.

Note, that this is somewhat like builtin Python file I/O, but
there are semantic differences to make it more efficient for
some backing filesystems. For example, a write mode file will
not be opened until the first write call (to minimize RPC
invocations in network filesystems).
"""

def __init__(self, name, mode='r'):
super(FastGFile, self).__init__(name=name, mode=mode)
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