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1// Copyright 2022 Google Inc. 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#import "TFLCommonUtil.h"
16
17#import "TFLQuantizationParameters+Internal.h"
18#import "tensorflow/lite/objc/apis/TFLTensor.h"
19
20#include "tensorflow/lite/c/c_api.h"
21
22NS_ASSUME_NONNULL_BEGIN
23
24TFLTensorDataType TFLTensorDataTypeFromCTensor(const TfLiteTensor *cTensor) {
25  TfLiteType cTensorType = TfLiteTensorType(cTensor);
26  switch (cTensorType) {
27    case kTfLiteFloat32:
28      return TFLTensorDataTypeFloat32;
29    case kTfLiteFloat16:
30      return TFLTensorDataTypeFloat16;
31    case kTfLiteFloat64:
32      return TFLTensorDataTypeFloat64;
33    case kTfLiteInt32:
34      return TFLTensorDataTypeInt32;
35    case kTfLiteUInt8:
36      return TFLTensorDataTypeUInt8;
37    case kTfLiteInt8:
38      return TFLTensorDataTypeInt8;
39    case kTfLiteInt64:
40      return TFLTensorDataTypeInt64;
41    case kTfLiteBool:
42      return TFLTensorDataTypeBool;
43    case kTfLiteInt16:
44      return TFLTensorDataTypeInt16;
45    case kTfLiteNoType:
46    case kTfLiteString:
47    case kTfLiteComplex64:
48    case kTfLiteComplex128:
49    case kTfLiteUInt16:
50    case kTfLiteUInt32:
51    case kTfLiteUInt64:
52    case kTfLiteResource:
53    case kTfLiteVariant:
54      // kTfLiteString, kTfLiteUInt64, kTfLiteComplex64, kTfLiteComplex128,
55      // kTfLiteResource and kTfLiteVariant are not supported in TensorFlow Lite
56      // Objc API.
57      return TFLTensorDataTypeNoType;
58  }
59}
60
61NSString *__nullable TFLTensorNameFromCTensor(const TfLiteTensor *cTensor) {
62  const char *cName = TfLiteTensorName(cTensor);
63  if (cName == nullptr) return nil;
64  return [NSString stringWithUTF8String:cName];
65}
66
67TFLQuantizationParameters *__nullable
68TFLQuantizationParamsFromCTensor(const TfLiteTensor *cTensor) {
69  TfLiteQuantizationParams cParams = TfLiteTensorQuantizationParams(cTensor);
70  TFLQuantizationParameters *quantizationParams;
71
72  // TODO(b/119735362): Update this check once the TfLiteQuantizationParams struct has a mode.
73  if (cParams.scale != 0.0) {
74    quantizationParams = [[TFLQuantizationParameters alloc] initWithScale:cParams.scale
75                                                                zeroPoint:cParams.zero_point];
76  }
77  return quantizationParams;
78}
79
80NS_ASSUME_NONNULL_END
81