1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "HashtableLookup.h"
18
19 #include "CpuExecutor.h"
20 #include "Operations.h"
21
22 #include "Tracing.h"
23
24 namespace android {
25 namespace nn {
26
27 namespace {
28
greater(const void * a,const void * b)29 int greater(const void* a, const void* b) {
30 return *static_cast<const int*>(a) - *static_cast<const int*>(b);
31 }
32
33 } // anonymous namespace
34
HashtableLookup(const Operation & operation,std::vector<RunTimeOperandInfo> & operands)35 HashtableLookup::HashtableLookup(const Operation& operation,
36 std::vector<RunTimeOperandInfo>& operands) {
37 lookup_ = GetInput(operation, operands, kLookupTensor);
38 key_ = GetInput(operation, operands, kKeyTensor);
39 value_ = GetInput(operation, operands, kValueTensor);
40
41 output_ = GetOutput(operation, operands, kOutputTensor);
42 hits_ = GetOutput(operation, operands, kHitsTensor);
43 }
44
Eval()45 bool HashtableLookup::Eval() {
46 NNTRACE_COMP("HashtableLookup::Eval");
47 const int num_rows = value_->shape().dimensions[0];
48 const int row_bytes = nonExtensionOperandSizeOfData(value_->type, value_->dimensions) / num_rows;
49 void* pointer = nullptr;
50
51 for (int i = 0; i < static_cast<int>(lookup_->shape().dimensions[0]); i++) {
52 int idx = -1;
53 pointer = bsearch(lookup_->buffer + sizeof(int) * i, key_->buffer,
54 num_rows, sizeof(int), greater);
55 if (pointer != nullptr) {
56 idx =
57 (reinterpret_cast<uint8_t*>(pointer) - key_->buffer) / sizeof(float);
58 }
59
60 if (idx >= num_rows || idx < 0) {
61 memset(output_->buffer + i * row_bytes, 0, row_bytes);
62 hits_->buffer[i] = 0;
63 } else {
64 memcpy(output_->buffer + i * row_bytes, value_->buffer + idx * row_bytes,
65 row_bytes);
66 hits_->buffer[i] = 1;
67 }
68 }
69
70 return true;
71 }
72
73 } // namespace nn
74 } // namespace android
75