1 | /* Copyright 2019 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 | #include "tensorflow/lite/c/common.h" |
16 | #include "tensorflow/lite/core/subgraph.h" |
17 | #include "tensorflow/lite/experimental/resource/lookup_interfaces.h" |
18 | #include "tensorflow/lite/kernels/internal/tensor_ctypes.h" |
19 | #include "tensorflow/lite/kernels/kernel_util.h" |
20 | |
21 | namespace tflite { |
22 | namespace ops { |
23 | namespace builtin { |
24 | |
25 | namespace hashtable { |
26 | |
27 | constexpr int kInputResourceIdTensor = 0; |
28 | constexpr int kKeyTensor = 1; |
29 | constexpr int kDefaultValueTensor = 2; |
30 | constexpr int kOutputTensor = 0; |
31 | |
32 | TfLiteStatus PrepareHashtableFind(TfLiteContext* context, TfLiteNode* node) { |
33 | TF_LITE_ENSURE_EQ(context, NumInputs(node), 3); |
34 | TF_LITE_ENSURE_EQ(context, NumOutputs(node), 1); |
35 | |
36 | const TfLiteTensor* input_resource_id_tensor; |
37 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kInputResourceIdTensor, |
38 | &input_resource_id_tensor)); |
39 | TF_LITE_ENSURE_EQ(context, input_resource_id_tensor->type, kTfLiteResource); |
40 | TF_LITE_ENSURE_EQ(context, NumDimensions(input_resource_id_tensor), 1); |
41 | TF_LITE_ENSURE_EQ(context, SizeOfDimension(input_resource_id_tensor, 0), 1); |
42 | |
43 | const TfLiteTensor* default_value_tensor; |
44 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kDefaultValueTensor, |
45 | &default_value_tensor)); |
46 | |
47 | const TfLiteTensor* key_tensor; |
48 | TF_LITE_ENSURE_OK(context, |
49 | GetInputSafe(context, node, kKeyTensor, &key_tensor)); |
50 | TfLiteTensor* output_tensor; |
51 | TF_LITE_ENSURE_OK( |
52 | context, GetOutputSafe(context, node, kOutputTensor, &output_tensor)); |
53 | TF_LITE_ENSURE_EQ(context, default_value_tensor->type, output_tensor->type); |
54 | TF_LITE_ENSURE(context, (key_tensor->type == kTfLiteInt64 && |
55 | output_tensor->type == kTfLiteString) || |
56 | (key_tensor->type == kTfLiteString && |
57 | output_tensor->type == kTfLiteInt64)); |
58 | return context->ResizeTensor(context, output_tensor, |
59 | TfLiteIntArrayCopy(key_tensor->dims)); |
60 | } |
61 | |
62 | TfLiteStatus EvalHashtableFind(TfLiteContext* context, TfLiteNode* node) { |
63 | const TfLiteTensor* input_resource_id_tensor; |
64 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kInputResourceIdTensor, |
65 | &input_resource_id_tensor)); |
66 | int resource_id = input_resource_id_tensor->data.i32[0]; |
67 | |
68 | const TfLiteTensor* key_tensor; |
69 | TF_LITE_ENSURE_OK(context, |
70 | GetInputSafe(context, node, kKeyTensor, &key_tensor)); |
71 | const TfLiteTensor* default_value_tensor; |
72 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kDefaultValueTensor, |
73 | &default_value_tensor)); |
74 | TfLiteTensor* output_tensor; |
75 | TF_LITE_ENSURE_OK(context, GetOutputSafe(context, node, 0, &output_tensor)); |
76 | |
77 | Subgraph* subgraph = reinterpret_cast<Subgraph*>(context->impl_); |
78 | auto& resources = subgraph->resources(); |
79 | auto* lookup = resource::GetHashtableResource(&resources, resource_id); |
80 | TF_LITE_ENSURE(context, lookup != nullptr); |
81 | TF_LITE_ENSURE_STATUS( |
82 | lookup->CheckKeyAndValueTypes(context, key_tensor, output_tensor)); |
83 | auto result = |
84 | lookup->Lookup(context, key_tensor, output_tensor, default_value_tensor); |
85 | return result; |
86 | } |
87 | |
88 | } // namespace hashtable |
89 | |
90 | TfLiteRegistration* Register_HASHTABLE_FIND() { |
91 | static TfLiteRegistration r = {/*init=*/nullptr, |
92 | /*free=*/nullptr, |
93 | hashtable::PrepareHashtableFind, |
94 | hashtable::EvalHashtableFind}; |
95 | return &r; |
96 | } |
97 | |
98 | } // namespace builtin |
99 | } // namespace ops |
100 | } // namespace tflite |
101 | |