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1# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#    http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14# ============================================================================
15"""Ops to manipulate hashmap of tensors."""
16
17from __future__ import absolute_import
18from __future__ import division
19from __future__ import print_function
20
21# go/tf-wildcard-import
22# pylint: disable=wildcard-import
23from tensorflow.python.framework import ops
24from tensorflow.python.ops import array_ops
25from tensorflow.python.ops import control_flow_ops
26from tensorflow.python.ops import gen_map_ops
27from tensorflow.python.ops.gen_map_ops import *
28
29ops.NotDifferentiable("EmptyTensorMap")
30
31def empty_tensor_map():
32  return gen_map_ops.empty_tensor_map()
33
34def tensor_map_size(input_handle):
35  return gen_map_ops.tensor_map_size(input_handle)
36
37def tensor_map_insert(input_handle, key, value):
38  return gen_map_ops.tensor_map_insert(input_handle, key, value)
39
40def tensor_map_lookup(input_handle, key, value_dtype):
41  return gen_map_ops.tensor_map_lookup(input_handle, key, value_dtype)
42
43def tensor_map_erase(input_handle, key, value_dtype):
44  return gen_map_ops.tensor_map_erase(input_handle, key, value_dtype)
45
46def tensor_map_has_key(input_handle, key):
47  return gen_map_ops.tensor_map_has_key(input_handle, key)
48
49
50def tensor_map_stack_keys(input_handle, key_dtype):
51  return gen_map_ops.tensor_map_stack_keys(input_handle, key_dtype)
52
53
54@ops.RegisterGradient("TensorMapLookup")
55def LookupGrad(op, dval):
56  _, k = op.inputs
57  map_grad = empty_tensor_map()
58  map_grad = tensor_map_insert(map_grad, k, dval)
59  key_grad = None
60  return map_grad, key_grad
61
62@ops.RegisterGradient("TensorMapInsert")
63def InsertGrad(op, dmap):
64  _, k, v = op.inputs
65  key_grad = None
66  (value_grad, map_grad) = control_flow_ops.cond(
67      tensor_map_has_key(dmap, k), lambda:
68      (tensor_map_lookup(dmap, k, v.dtype), tensor_map_erase(dmap, k, v.dtype)),
69      lambda: (array_ops.zeros_like(v), dmap))
70  return map_grad, key_grad, value_grad
71
72@ops.RegisterGradient("TensorMapErase")
73def EraseGrad(op, dmap):
74  key_grad = None
75  map_grad = dmap
76  return map_grad, key_grad
77