1 | /* Copyright 2018 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 | |
16 | #include <stdint.h> |
17 | |
18 | #include "tensorflow/lite/c/builtin_op_data.h" |
19 | #include "tensorflow/lite/c/common.h" |
20 | #include "tensorflow/lite/kernels/internal/reference/reference_ops.h" |
21 | #include "tensorflow/lite/kernels/internal/tensor.h" |
22 | #include "tensorflow/lite/kernels/internal/tensor_ctypes.h" |
23 | #include "tensorflow/lite/kernels/kernel_util.h" |
24 | |
25 | namespace tflite { |
26 | namespace ops { |
27 | namespace builtin { |
28 | namespace reverse_sequence { |
29 | namespace { |
30 | |
31 | constexpr int kInputTensor = 0; |
32 | constexpr int kSeqLengthsTensor = 1; |
33 | constexpr int kOutputTensor = 0; |
34 | |
35 | TfLiteStatus Prepare(TfLiteContext* context, TfLiteNode* node) { |
36 | TF_LITE_ENSURE_EQ(context, NumInputs(node), 2); |
37 | TF_LITE_ENSURE_EQ(context, NumOutputs(node), 1); |
38 | |
39 | const TfLiteTensor* input; |
40 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kInputTensor, &input)); |
41 | const TfLiteTensor* seq_lengths; |
42 | TF_LITE_ENSURE_OK( |
43 | context, GetInputSafe(context, node, kSeqLengthsTensor, &seq_lengths)); |
44 | TF_LITE_ENSURE_EQ(context, NumDimensions(seq_lengths), 1); |
45 | |
46 | if (input->type != kTfLiteInt32 && input->type != kTfLiteFloat32 && |
47 | input->type != kTfLiteUInt8 && input->type != kTfLiteInt16 && |
48 | input->type != kTfLiteInt64) { |
49 | TF_LITE_KERNEL_LOG(context, |
50 | "Type '%s' is not supported by reverse_sequence." , |
51 | TfLiteTypeGetName(input->type)); |
52 | return kTfLiteError; |
53 | } |
54 | |
55 | if (seq_lengths->type != kTfLiteInt32 && seq_lengths->type != kTfLiteInt64) { |
56 | TF_LITE_KERNEL_LOG( |
57 | context, "Seq_lengths type '%s' is not supported by reverse_sequence." , |
58 | TfLiteTypeGetName(seq_lengths->type)); |
59 | return kTfLiteError; |
60 | } |
61 | |
62 | TfLiteTensor* output; |
63 | TF_LITE_ENSURE_OK(context, |
64 | GetOutputSafe(context, node, kOutputTensor, &output)); |
65 | TfLiteIntArray* output_shape = TfLiteIntArrayCopy(input->dims); |
66 | TF_LITE_ENSURE_TYPES_EQ(context, output->type, input->type); |
67 | |
68 | return context->ResizeTensor(context, output, output_shape); |
69 | } |
70 | |
71 | template <typename T, typename TS> |
72 | TfLiteStatus ReverseSequenceImpl(TfLiteContext* context, TfLiteNode* node) { |
73 | const TfLiteTensor* input; |
74 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kInputTensor, &input)); |
75 | const TfLiteTensor* seq_lengths_tensor; |
76 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kSeqLengthsTensor, |
77 | &seq_lengths_tensor)); |
78 | const TS* seq_lengths = GetTensorData<TS>(seq_lengths_tensor); |
79 | |
80 | auto* params = |
81 | reinterpret_cast<TfLiteReverseSequenceParams*>(node->builtin_data); |
82 | int seq_dim = params->seq_dim; |
83 | int batch_dim = params->batch_dim; |
84 | |
85 | TF_LITE_ENSURE(context, seq_dim >= 0); |
86 | TF_LITE_ENSURE(context, batch_dim >= 0); |
87 | TF_LITE_ENSURE(context, seq_dim != batch_dim); |
88 | TF_LITE_ENSURE(context, seq_dim < NumDimensions(input)); |
89 | TF_LITE_ENSURE(context, batch_dim < NumDimensions(input)); |
90 | TF_LITE_ENSURE_EQ(context, SizeOfDimension(seq_lengths_tensor, 0), |
91 | SizeOfDimension(input, batch_dim)); |
92 | for (int i = 0; i < NumDimensions(seq_lengths_tensor); ++i) { |
93 | TF_LITE_ENSURE(context, seq_lengths[i] <= SizeOfDimension(input, seq_dim)); |
94 | } |
95 | |
96 | TfLiteTensor* output; |
97 | TF_LITE_ENSURE_OK(context, |
98 | GetOutputSafe(context, node, kOutputTensor, &output)); |
99 | |
100 | reference_ops::ReverseSequence<T, TS>( |
101 | seq_lengths, seq_dim, batch_dim, GetTensorShape(input), |
102 | GetTensorData<T>(input), GetTensorShape(output), |
103 | GetTensorData<T>(output)); |
104 | |
105 | return kTfLiteOk; |
106 | } |
107 | |
108 | template <typename T> |
109 | TfLiteStatus ReverseSequenceHelper(TfLiteContext* context, TfLiteNode* node) { |
110 | const TfLiteTensor* seq_lengths_tensor; |
111 | TF_LITE_ENSURE_OK(context, GetInputSafe(context, node, kSeqLengthsTensor, |
112 | &seq_lengths_tensor)); |
113 | switch (seq_lengths_tensor->type) { |
114 | case kTfLiteInt32: { |
115 | return ReverseSequenceImpl<T, int32_t>(context, node); |
116 | } |
117 | case kTfLiteInt64: { |
118 | return ReverseSequenceImpl<T, int64_t>(context, node); |
119 | } |
120 | default: { |
121 | TF_LITE_KERNEL_LOG( |
122 | context, |
123 | "Seq_lengths type '%s' is not supported by reverse_sequence." , |
124 | TfLiteTypeGetName(seq_lengths_tensor->type)); |
125 | return kTfLiteError; |
126 | } |
127 | } |
128 | return kTfLiteOk; |
129 | } |
130 | |
131 | TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) { |
132 | TfLiteTensor* output; |
133 | TF_LITE_ENSURE_OK(context, |
134 | GetOutputSafe(context, node, kOutputTensor, &output)); |
135 | |
136 | switch (output->type) { |
137 | case kTfLiteFloat32: { |
138 | return ReverseSequenceHelper<float>(context, node); |
139 | } |
140 | case kTfLiteUInt8: { |
141 | return ReverseSequenceHelper<uint8_t>(context, node); |
142 | } |
143 | case kTfLiteInt16: { |
144 | return ReverseSequenceHelper<int16_t>(context, node); |
145 | } |
146 | case kTfLiteInt32: { |
147 | return ReverseSequenceHelper<int32_t>(context, node); |
148 | } |
149 | case kTfLiteInt64: { |
150 | return ReverseSequenceHelper<int64_t>(context, node); |
151 | } |
152 | default: { |
153 | TF_LITE_KERNEL_LOG(context, |
154 | "Type '%s' is not supported by reverse_sequence." , |
155 | TfLiteTypeGetName(output->type)); |
156 | return kTfLiteError; |
157 | } |
158 | } |
159 | } // namespace |
160 | |
161 | } // namespace |
162 | } // namespace reverse_sequence |
163 | |
164 | TfLiteRegistration* Register_REVERSE_SEQUENCE() { |
165 | static TfLiteRegistration r = {nullptr, nullptr, reverse_sequence::Prepare, |
166 | reverse_sequence::Eval}; |
167 | return &r; |
168 | } |
169 | |
170 | } // namespace builtin |
171 | } // namespace ops |
172 | } // namespace tflite |
173 | |