1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
# Copyright 2018 The TensorFlow 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.
# ==============================================================================
"""Device-related support functions."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.python.eager import context
from tensorflow.python.framework import device as tf_device
from tensorflow.python.framework import ops
def canonicalize(d, default=None):
"""Canonicalize device string.
If d has missing components, the rest would be deduced from the `default`
argument or from '/replica:0/task:0/device:CPU:0'. For example:
If d = '/cpu:0', default='/job:worker/task:1', it returns
'/job:worker/replica:0/task:1/device:CPU:0'.
If d = '/cpu:0', default='/job:worker', it returns
'/job:worker/replica:0/task:0/device:CPU:0'.
If d = '/gpu:0', default=None, it returns
'/replica:0/task:0/device:GPU:0'.
Note: This uses "job:localhost" as the default if executing eagerly.
Args:
d: a device string.
default: a string for default device if d doesn't have all components.
Returns:
a canonicalized device string.
"""
d = tf_device.DeviceSpec.from_string(d)
assert d.device_type is None or d.device_type == d.device_type.upper(), (
"Device type '%s' must be all-caps." % (d.device_type,))
# Fill in missing device fields using defaults.
result = tf_device.DeviceSpec(
replica=0, task=0, device_type="CPU", device_index=0)
if context.executing_eagerly():
result.job = "localhost"
if default:
result.merge_from(tf_device.DeviceSpec.from_string(default))
result.merge_from(d)
return result.to_string()
def resolve(d):
"""Canonicalize `d` with current device as default."""
return canonicalize(d, default=current())
class _FakeNodeDef(object):
"""A fake NodeDef for _FakeOperation."""
def __init__(self):
self.op = ""
self.name = ""
class _FakeOperation(object):
"""A fake Operation object to pass to device functions."""
def __init__(self):
self.device = ""
self.type = ""
self.name = ""
self.node_def = _FakeNodeDef()
def _set_device(self, device):
self.device = ops._device_string(device) # pylint: disable=protected-access
def current():
"""Return a string (not canonicalized) for the current device."""
# TODO(josh11b): Work out how this function interacts with ops.colocate_with.
ctx = context.context()
if ctx.executing_eagerly():
d = ctx.device_name
else:
op = _FakeOperation()
ops.get_default_graph()._apply_device_functions(op) # pylint: disable=protected-access
d = op.device
return d
|
