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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
17# go/tf-wildcard-import
18# pylint: disable=wildcard-import
19from tensorflow.python.framework import ops
20from tensorflow.python.ops import array_ops
21from tensorflow.python.ops import control_flow_ops
22from tensorflow.python.ops import gen_map_ops
23from tensorflow.python.ops.gen_map_ops import *
24
25ops.NotDifferentiable("EmptyTensorMap")
26
27def empty_tensor_map():
28  return gen_map_ops.empty_tensor_map()
29
30def tensor_map_size(input_handle):
31  return gen_map_ops.tensor_map_size(input_handle)
32
33def tensor_map_insert(input_handle, key, value):
34  return gen_map_ops.tensor_map_insert(input_handle, key, value)
35
36def tensor_map_lookup(input_handle, key, value_dtype):
37  return gen_map_ops.tensor_map_lookup(input_handle, key, value_dtype)
38
39def tensor_map_erase(input_handle, key, value_dtype):
40  return gen_map_ops.tensor_map_erase(input_handle, key, value_dtype)
41
42def tensor_map_has_key(input_handle, key):
43  return gen_map_ops.tensor_map_has_key(input_handle, key)
44
45
46def tensor_map_stack_keys(input_handle, key_dtype):
47  return gen_map_ops.tensor_map_stack_keys(input_handle, key_dtype)
48
49
50@ops.RegisterGradient("TensorMapLookup")
51def LookupGrad(op, dval):
52  _, k = op.inputs
53  map_grad = empty_tensor_map()
54  map_grad = tensor_map_insert(map_grad, k, dval)
55  key_grad = None
56  return map_grad, key_grad
57
58@ops.RegisterGradient("TensorMapInsert")
59def InsertGrad(op, dmap):
60  _, k, v = op.inputs
61  key_grad = None
62  (value_grad, map_grad) = control_flow_ops.cond(
63      tensor_map_has_key(dmap, k), lambda:
64      (tensor_map_lookup(dmap, k, v.dtype), tensor_map_erase(dmap, k, v.dtype)),
65      lambda: (array_ops.zeros_like(v), dmap))
66  return map_grad, key_grad, value_grad
67
68@ops.RegisterGradient("TensorMapErase")
69def EraseGrad(op, dmap):
70  key_grad = None
71  map_grad = dmap
72  return map_grad, key_grad
73