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 #define LOG_TAG "Operations"
18
19 #include "HashtableLookup.h"
20
21 #include "CpuExecutor.h"
22 #include "Operations.h"
23 #include "Tracing.h"
24
25 namespace android {
26 namespace nn {
27
28 namespace {
29
greater(const void * a,const void * b)30 int greater(const void* a, const void* b) {
31 return *static_cast<const int*>(a) - *static_cast<const int*>(b);
32 }
33
34 } // anonymous namespace
35
HashtableLookup(const Operation & operation,RunTimeOperandInfo * operands)36 HashtableLookup::HashtableLookup(const Operation& operation, 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 =
49 nonExtensionOperandSizeOfData(value_->type, value_->dimensions) / num_rows;
50 void* pointer = nullptr;
51
52 for (int i = 0; i < static_cast<int>(lookup_->shape().dimensions[0]); i++) {
53 int idx = -1;
54 pointer = bsearch(lookup_->buffer + sizeof(int) * i, key_->buffer, num_rows, sizeof(int),
55 greater);
56 if (pointer != nullptr) {
57 idx = (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, row_bytes);
65 hits_->buffer[i] = 1;
66 }
67 }
68
69 return true;
70 }
71
72 } // namespace nn
73 } // namespace android
74