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텐서플로우:: 작전:: 역양자화
#include <array_ops.h>
'입력' 텐서를 float 또는 bfloat16 Tensor 로 역양자화합니다 .
요약
[min_range, max_range]는 출력 범위를 지정하는 스칼라 부동 소수점입니다. 'mode' 속성은 float 값을 양자화된 값으로 변환하는 데 사용되는 계산을 정확하게 제어합니다.
'MIN_COMBINED' 모드에서 텐서의 각 값은 다음을 수행합니다.
if T == qint8: in[i] += (range(T) + 1)/ 2.0
out[i] = min_range + (in[i]* (max_range - min_range) / range(T))
여기서
range(T) = numeric_limits ::max() - numeric_limits ::min()
range(T) = numeric_limits ::max() - numeric_limits ::min()
range(T) = numeric_limits ::max() - numeric_limits ::min()
MIN_COMBINED 모드 예
입력이 QuantizedRelu6 에서 오는 경우 출력 유형은 quint8(0-255 범위)이지만 QuantizedRelu6 의 가능한 범위는 0-6입니다. 따라서 min_range 및 max_range 값은 0.0과 6.0입니다. quint8의 역양자화는 각 값을 가져와 부동 소수점으로 변환하고 6/255를 곱합니다. 양자화 유형이 qint8인 경우 작업은 캐스팅하기 전에 각 값에 128을 추가로 추가합니다.
모드가 'MIN_FIRST'인 경우 다음 접근 방식이 사용됩니다.
num_discrete_values = 1 << (# of bits in T)
range_adjust = num_discrete_values / (num_discrete_values - 1)
range = (range_max - range_min) * range_adjust
range_scale = range / num_discrete_values
const double offset_input = static_cast(input) - lowest_quantized;
result = range_min + ((input - numeric_limits::min()) * range_scale)
모드가 SCALED
인 경우 각 입력 값에 scale_factor를 곱하여 역양자화를 수행합니다. (따라서 0의 입력은 항상 0.0으로 매핑됩니다.)
scale_factor는 다음 알고리즘을 사용하여 QuantizeAndDequantize{V2|V3}
및 QuantizeV2
와 호환되는 방식으로 min_range
, max_range
및 narrow_range
에서 결정됩니다.
const int min_expected_T = std::numeric_limits::min() +
(narrow_range ? 1 : 0);
const int max_expected_T = std::numeric_limits::max();
const float max_expected_T = std::numeric_limits::max();
const float scale_factor =
(std::numeric_limits::min() == 0) ? (max_range / max_expected_T)
: std::max(min_range / min_expected_T,
max_range / max_expected_T);
인수:
- 범위: 범위 개체
- min_range: 입력에 대해 생성될 수 있는 최소 스칼라 값입니다.
- max_range: 입력에 대해 생성될 수 있는 최대 스칼라 값입니다.
선택적 속성( Attrs
참조):
- dtype: 출력 텐서의 유형입니다. 현재 DeQuantize는 float 및 bfloat16을 지원합니다. 'dtype'이 'bfloat16'인 경우 'MIN_COMBINED' 모드만 지원합니다.
보고:
공개 속성
공공 기능
마디
::tensorflow::Node * node() const
operator::tensorflow::Input() const
연산자::텐서플로우::출력
operator::tensorflow::Output() const
공개 정적 함수
중심선
Attrs Axis(
int64 x
)
Dtype
Attrs Dtype(
DataType x
)
방법
Attrs Mode(
StringPiece x
)
좁은 범위
Attrs NarrowRange(
bool x
)
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최종 업데이트: 2025-07-27(UTC)
[null,null,["최종 업데이트: 2025-07-27(UTC)"],[],[],null,["# tensorflow::ops::Dequantize Class Reference\n\ntensorflow::ops::Dequantize\n===========================\n\n`#include \u003carray_ops.h\u003e`\n\n[Dequantize](/versions/r2.3/api_docs/cc/class/tensorflow/ops/dequantize#classtensorflow_1_1ops_1_1_dequantize) the 'input' tensor into a float or bfloat16 [Tensor](/versions/r2.3/api_docs/cc/class/tensorflow/tensor#classtensorflow_1_1_tensor).\n\nSummary\n-------\n\n\\[min_range, max_range\\] are scalar floats that specify the range for the output. The 'mode' attribute controls exactly which calculations are used to convert the float values to their quantized equivalents.\n\nIn 'MIN_COMBINED' mode, each value of the tensor will undergo the following:\n\n\u003cbr /\u003e\n\n```transact-sql\nif T == qint8: in[i] += (range(T) + 1)/ 2.0\nout[i] = min_range + (in[i]* (max_range - min_range) / range(T))\n```\nhere `range(T) = numeric_limits`::max() - numeric_limits::min()\n\n\u003cbr /\u003e\n\n\n*MIN_COMBINED Mode Example*\n\nIf the input comes from a [QuantizedRelu6](/versions/r2.3/api_docs/cc/class/tensorflow/ops/quantized-relu6#classtensorflow_1_1ops_1_1_quantized_relu6), the output type is quint8 (range of 0-255) but the possible range of [QuantizedRelu6](/versions/r2.3/api_docs/cc/class/tensorflow/ops/quantized-relu6#classtensorflow_1_1ops_1_1_quantized_relu6) is 0-6. The min_range and max_range values are therefore 0.0 and 6.0. [Dequantize](/versions/r2.3/api_docs/cc/class/tensorflow/ops/dequantize#classtensorflow_1_1ops_1_1_dequantize) on quint8 will take each value, cast to float, and multiply by 6 / 255. Note that if quantizedtype is qint8, the operation will additionally add each value by 128 prior to casting.\n\nIf the mode is 'MIN_FIRST', then this approach is used:\n\n\n```gdscript\nnum_discrete_values = 1 \u003c\u003c (# of bits in T)\nrange_adjust = num_discrete_values / (num_discrete_values - 1)\nrange = (range_max - range_min) * range_adjust\nrange_scale = range / num_discrete_values\nconst double offset_input = static_cast(input) - lowest_quantized;\nresult = range_min + ((input - numeric_limits::min()) * range_scale)\n```\n\n\u003cbr /\u003e\n\nIf the mode is `SCALED`, dequantization is performed by multiplying each input value by a scaling_factor. (Thus an input of 0 always maps to 0.0).\n\nThe scaling_factor is determined from `min_range`, `max_range`, and `narrow_range` in a way that is compatible with `QuantizeAndDequantize{V2|V3}` and [QuantizeV2](/versions/r2.3/api_docs/cc/class/tensorflow/ops/quantize-v2#classtensorflow_1_1ops_1_1_quantize_v2), using the following algorithm:\n\n\n````gdscript\n \n \n const int min_expected_T = std::numeric_limits::min() +\n (narrow_range ? 1 : 0);\n const int max_expected_T = std::numeric_limits::max();\n const float max_expected_T = std::numeric_limits::max();\n \n \n \n```gdscript\n const float scale_factor =\n (std::numeric_limits::min() == 0) ? (max_range / max_expected_T)\n : std::max(min_range / min_expected_T,\n max_range / max_expected_T);\n```\n\n \n Arguments:\n \n- scope: A /versions/r2.3/api_docs/cc/class/tensorflow/scope#classtensorflow_1_1_scope object\n\n \n- min_range: The minimum scalar value possibly produced for the input.\n\n \n- max_range: The maximum scalar value possibly produced for the input.\n\n \n\n Optional attributes (see /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs):\n \n- dtype: Type of the output tensor. Currently /versions/r2.3/api_docs/cc/class/tensorflow/ops/dequantize#classtensorflow_1_1ops_1_1_dequantize supports float and bfloat16. If 'dtype' is 'bfloat16', it only supports 'MIN_COMBINED' mode.\n\n \n Returns:\n \n- /versions/r2.3/api_docs/cc/class/tensorflow/output#classtensorflow_1_1_output: The output tensor. \n\n \n \n \n \n \n### Constructors and Destructors\n\n\n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1ace6411557abc00c6e59649720be7d579`(const ::`/versions/r2.3/api_docs/cc/class/tensorflow/scope#classtensorflow_1_1_scope` & scope, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` input, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` min_range, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` max_range)`\n \n\n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1afb71f46f9e4fc4922578ecd9116ad9b1`(const ::`/versions/r2.3/api_docs/cc/class/tensorflow/scope#classtensorflow_1_1_scope` & scope, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` input, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` min_range, ::`/versions/r2.3/api_docs/cc/class/tensorflow/input#classtensorflow_1_1_input` max_range, const `/versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs` & attrs)`\n \n\n \n \n \n \n \n \n \n### Public attributes\n\n\n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1a917ce29fbec6ef49406db9a374bde9aa\n \n \n \n /versions/r2.3/api_docs/cc/class/tensorflow/operation#classtensorflow_1_1_operation\n \n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1a5c4618ae3d058bcd8547217612f8f41e\n \n \n \n `::`/versions/r2.3/api_docs/cc/class/tensorflow/output#classtensorflow_1_1_output\n \n \n \n \n \n \n \n \n### Public functions\n\n\n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1a4bdeb613e4b88880638a67528cbd01f0`() const `\n \n \n \n `::tensorflow::Node *`\n \n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1ab1b62ee39a382d6e124eb62156c05525`() const `\n \n \n \n `\n `\n`\n `\n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1ae01ee2df9b62f7729848ca15ed70e8fc`() const `\n \n \n \n `\n `\n`\n `\n \n \n \n \n \n \n### Public static functions\n\n\n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1ac0b7d9ea267e2c8719f63ff4434b5250`(int64 x)`\n \n \n \n /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs\n \n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1aeb2c0e323cdc6f85554c6e03de751730`(DataType x)`\n \n \n \n /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs\n \n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1ac9873b34c5c0eb36296e0fe726644fc9`(StringPiece x)`\n \n \n \n /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs\n \n \n \n \n \n #classtensorflow_1_1ops_1_1_dequantize_1a4409107547aae6b42715813687850b35`(bool x)`\n \n \n \n /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs#structtensorflow_1_1ops_1_1_dequantize_1_1_attrs\n \n \n \n \n \n \n \n \n### Structs\n\n\n \n \n \n \n /versions/r2.3/api_docs/cc/struct/tensorflow/ops/dequantize/attrs\n \n \n Optional attribute setters for /versions/r2.3/api_docs/cc/class/tensorflow/ops/dequantize#classtensorflow_1_1ops_1_1_dequantize. \n\n \n \n \n Public attributes\n \n \n### operation\n\n\n \n\n\n```text\nOperation operation\n```\n\n \n\n \n \n \n### output\n\n\n \n\n\n```text\n::tensorflow::Output output\n```\n\n \n\n \n Public functions\n \n \n### Dequantize\n\n\n \n\n\n```gdscript\n Dequantize(\n const ::tensorflow::Scope & scope,\n ::tensorflow::Input input,\n ::tensorflow::Input min_range,\n ::tensorflow::Input max_range\n)\n```\n\n \n\n \n \n \n### Dequantize\n\n\n \n\n\n```gdscript\n Dequantize(\n const ::tensorflow::Scope & scope,\n ::tensorflow::Input input,\n ::tensorflow::Input min_range,\n ::tensorflow::Input max_range,\n const Dequantize::Attrs & attrs\n)\n```\n\n \n\n \n \n \n### node\n\n\n \n\n\n```gdscript\n::tensorflow::Node * node() const \n```\n\n \n\n \n \n \n### operator::tensorflow::Input\n\n\n \n\n\n```gdscript\n operator::tensorflow::Input() const \n```\n\n \n\n \n \n \n### operator::tensorflow::Output\n\n\n \n\n\n```gdscript\n operator::tensorflow::Output() const \n```\n\n \n\n \n Public static functions\n \n \n### Axis\n\n\n \n\n\n```text\nAttrs Axis(\n int64 x\n)\n```\n\n \n\n \n \n \n### Dtype\n\n\n \n\n\n```carbon\nAttrs Dtype(\n DataType x\n)\n```\n\n \n\n \n \n \n### Mode\n\n\n \n\n\n```text\nAttrs Mode(\n StringPiece x\n)\n```\n\n \n\n \n \n \n### NarrowRange\n\n\n \n\n\n```text\nAttrs NarrowRange(\n bool x\n)\n```\n\n \n\n \n\n \n\n \n````"]]