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[JS/WebGPU] Add GatherBlockQuantized op support (microsoft#21734)
### Description Add GatherBlockQuantized operator to JSEP. ### Motivation and Context Gemma model requires this.
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js/web/lib/wasm/jsep/webgpu/ops/gather-block-quantized.ts
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| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT License. | ||
|
|
||
| import { DataType } from '../../../wasm-common'; | ||
| import { TensorView } from '../../tensor-view'; | ||
| import { ShapeUtil } from '../../util'; | ||
| import { AttributeWithCacheKey, createAttributeWithCacheKey } from '../attribute-with-cache-key'; | ||
| import { ComputeContext, ProgramInfo, ProgramUniform } from '../types'; | ||
|
|
||
| import { | ||
| createTensorShapeVariables, | ||
| inputVariable, | ||
| outputVariable, | ||
| ShaderHelper, | ||
| tensorTypeToWsglValueType, | ||
| UniformsArrayType, | ||
| } from './common'; | ||
|
|
||
| export interface GatherBlockQuantizedAttributes extends AttributeWithCacheKey { | ||
| gatherAxis: number; | ||
| quantizeAxis: number; | ||
| blockSize: number; | ||
| } | ||
|
|
||
| export const validateInputs = (inputs: readonly TensorView[], attributes: GatherBlockQuantizedAttributes): void => { | ||
| if (inputs.length < 3 || inputs.length > 4) { | ||
| throw new Error('GatherBlockQuantized requires 3 or 4 inputs.'); | ||
| } | ||
| const quantizeAxis = ShapeUtil.normalizeAxis(attributes.quantizeAxis, inputs[0].dims.length); | ||
| const blockSize = attributes.blockSize; | ||
| const data = inputs[0]; | ||
| const scales = inputs[2]; | ||
| const zeroPoint = inputs.length === 4 ? inputs[3] : undefined; | ||
| if ( | ||
| scales.dims.length !== data.dims.length || | ||
| !data.dims | ||
| .map((d, i) => (i === quantizeAxis ? Math.ceil(d / blockSize) === scales.dims[i] : d === scales.dims[i])) | ||
| .reduce((a, b) => a && b, true) | ||
| ) { | ||
| throw new Error( | ||
| 'Scales must have the same rank as the input tensor and the dims should match except on gatherAxis.', | ||
| ); | ||
| } | ||
| // TODO Uncomment the following check once the test case creation code is fixed to create data correctly aligned. | ||
| // const indices = inputs[1]; | ||
| // const validIndex = (index: number) => index >= 0 && index < data.dims[attributes.gatherAxis]; | ||
| // if (indices.dataType === DataType.int32 && indices.getInt32Array().some((v) => !validIndex(v)) || | ||
| // indices.dataType === DataType.int64 && indices.getBigInt64Array().some((v) => !validIndex(Number(v)))) { | ||
| // throw new Error('Indices must be within the bounds of the gatherAxis.'); | ||
| // } | ||
| if (zeroPoint) { | ||
| if (zeroPoint.dataType !== data.dataType) { | ||
| throw new Error('Zero point must have the same data type as the input tensor.'); | ||
| } | ||
| if ( | ||
| zeroPoint.dims.length !== scales.dims.length || | ||
| !zeroPoint.dims.map((d, i) => d === scales.dims[i]).reduce((a, b) => a && b, true) | ||
| ) { | ||
| throw new Error( | ||
| 'Zero point must have the same rank as the input tensor and the dims should match except on quantizeAxis.', | ||
| ); | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| const createGatherBlockQuantizedProgramInfo = ( | ||
| inputs: readonly TensorView[], | ||
| attributes: GatherBlockQuantizedAttributes, | ||
| ): ProgramInfo => { | ||
| const inputShape = inputs[0].dims; | ||
| const indicesShape = inputs[1].dims; | ||
| const inputRank = inputShape.length; | ||
| const gatherAxis = ShapeUtil.normalizeAxis(attributes.gatherAxis, inputRank); | ||
| const quantizeAxis = ShapeUtil.normalizeAxis(attributes.quantizeAxis, inputRank); | ||
| const outputShape = inputShape.slice(0); | ||
| outputShape.splice(gatherAxis, 1, ...indicesShape); | ||
| const outputSize = ShapeUtil.size(outputShape); | ||
| const outputType = inputs[2].dataType; | ||
| const inputType = inputs[0].dataType; | ||
| const isSigned = inputType === DataType.int4; // input data type is either int4 or uint4. | ||
| const programUniforms: ProgramUniform[] = [ | ||
| { type: DataType.uint32, data: outputSize }, | ||
| { type: DataType.uint32, data: quantizeAxis }, | ||
| { type: DataType.uint32, data: gatherAxis }, | ||
| { type: DataType.uint32, data: attributes.blockSize }, | ||
| ...createTensorShapeVariables(...inputs.map((input, _) => input.dims), outputShape), | ||
| ]; | ||
|
|
||
| const getShaderSource = (shaderHelper: ShaderHelper) => { | ||
| const data = inputVariable('data', inputs[0].dataType, inputs[0].dims.length); | ||
| const indices = inputVariable('inputIndices', inputs[1].dataType, inputs[1].dims.length); | ||
| const scales = inputVariable('scales', inputs[2].dataType, inputs[2].dims.length); | ||
| const zeroPoint = | ||
| inputs.length > 3 ? inputVariable('zeroPoint', inputs[3].dataType, inputs[3].dims.length) : undefined; | ||
| const output = outputVariable('output', outputType, outputShape.length); | ||
| const inputVariables = [data, indices, scales]; | ||
| if (zeroPoint) { | ||
| inputVariables.push(zeroPoint); | ||
| } | ||
| const uniforms: UniformsArrayType = [ | ||
| { name: 'output_size', type: 'u32' }, | ||
| { name: 'quantize_axis', type: 'u32' }, | ||
| { name: 'gather_axis', type: 'u32' }, | ||
| { name: 'block_size', type: 'u32' }, | ||
| ]; | ||
| return ` | ||
| ${shaderHelper.registerUniforms(uniforms).declareVariables(...inputVariables, output)} | ||
| ${shaderHelper.mainStart()} | ||
| let output_indices = ${output.offsetToIndices('global_idx')}; | ||
| var indices_indices = ${indices.type.indices}(0); | ||
| ${(() => { | ||
| if (indicesShape.length > 1) { | ||
| return ` | ||
| for (var i: u32 = 0; i < ${indicesShape.length}; i++) { | ||
| let index = ${output.indicesGet('output_indices', 'uniforms.gather_axis + i')}; | ||
| ${indices.indicesSet('indices_indices', 'i', 'index')}; | ||
| }`; | ||
| } else { | ||
| return `indices_indices = ${output.indicesGet('output_indices', 'uniforms.gather_axis')};`; | ||
| } | ||
| })()}; | ||
| var data_indices = ${data.type.indices}(0); | ||
| for (var i: u32 = 0; i < uniforms.gather_axis; i++) { | ||
| let index = ${output.indicesGet('output_indices', 'i')}; | ||
| ${data.indicesSet('data_indices', 'i', 'index')}; | ||
| } | ||
| var index_from_indices = ${indices.getByIndices('indices_indices')}; | ||
| if (index_from_indices < 0) { | ||
| index_from_indices += ${inputShape[gatherAxis]}; | ||
| } | ||
| ${data.indicesSet('data_indices', 'uniforms.gather_axis', 'u32(index_from_indices)')}; | ||
| for (var i = uniforms.gather_axis + 1; i < ${outputShape.length}; i++) { | ||
| let index = ${output.indicesGet('output_indices', `i + ${indicesShape.length} - 1`)}; | ||
| ${data.indicesSet('data_indices', 'i', 'index')}; | ||
| } | ||
| let data_offset = ${data.indicesToOffset('data_indices')}; | ||
| let data_index = data_offset % 8; | ||
| // Convert 4-bit packed data to 8-bit packed data. | ||
| let packed_4bit_quantized_data = ${data.getByOffset('data_offset / 8')}; | ||
| let packed_8bit_quantized_data = (packed_4bit_quantized_data >> (4 * (data_index % 2))) & 0x0f0f0f0f; | ||
| let quantized_data_vec = ${isSigned ? 'unpack4xI8' : 'unpack4xU8'}(u32(packed_8bit_quantized_data)); | ||
| let quantized_data = quantized_data_vec[data_index / 2]; | ||
| var scale_indices = data_indices; | ||
| let quantize_axis_index = ${scales.indicesGet('data_indices', 'uniforms.quantize_axis')} / uniforms.block_size; | ||
| ${scales.indicesSet('scale_indices', 'uniforms.quantize_axis', 'quantize_axis_index')}; | ||
| var scale = ${scales.getByIndices('scale_indices')}; | ||
| ${(() => { | ||
| if (!zeroPoint) { | ||
| return 'var zero_point = 0'; | ||
| } else { | ||
| return ` | ||
| let zero_point_indices = scale_indices; | ||
| let zero_point_offset = ${zeroPoint.indicesToOffset('zero_point_indices')}; | ||
| let zero_point_index = zero_point_offset % 8; | ||
| let packed_4bit_zero_points = ${zeroPoint.getByOffset('zero_point_offset / 8')}; | ||
| let packed_8bit_zero_points = (packed_4bit_zero_points >> (4 * (zero_point_index % 2))) & 0x0f0f0f0f; | ||
| let zero_point_vec = ${isSigned ? 'unpack4xI8' : 'unpack4xU8'}(u32(packed_8bit_zero_points)); | ||
| let zero_point = zero_point_vec[zero_point_index / 2];`; | ||
| } | ||
| })()}; | ||
| let dequantized_data = ${tensorTypeToWsglValueType(outputType)}(quantized_data - zero_point) * scale; | ||
| ${output.setByOffset('global_idx', 'dequantized_data')}; | ||
| }`; | ||
| }; | ||
| return { | ||
| name: 'GatherBlockQuantized', | ||
| shaderCache: { | ||
| hint: `${attributes.cacheKey};${inputs | ||
| .filter((_, i) => i !== 1) | ||
| .map((input) => input.dims.join('_')) | ||
| .join(';')}`, | ||
| inputDependencies: Array.from({ length: inputs.length }, (_v, _i) => 'rank'), | ||
| }, | ||
| getRunData: () => ({ | ||
| outputs: [{ dims: outputShape, dataType: outputType }], | ||
| dispatchGroup: { x: Math.ceil(outputSize / 64 /* workgroup size */) }, | ||
| programUniforms, | ||
| }), | ||
| getShaderSource, | ||
| }; | ||
| }; | ||
|
|
||
| export const gatherBlockQuantized = (context: ComputeContext, attributes: GatherBlockQuantizedAttributes): void => { | ||
| const inputs = context.inputs; | ||
| validateInputs(inputs, attributes); | ||
| context.compute(createGatherBlockQuantizedProgramInfo(context.inputs, attributes)); | ||
| }; | ||
|
|
||
| export const parseGatherBlockQuantizedAttributes = ( | ||
| attributes: Record<string, unknown>, | ||
| ): GatherBlockQuantizedAttributes => | ||
| createAttributeWithCacheKey({ | ||
| blockSize: attributes.blockSize as number, | ||
| gatherAxis: attributes.gatherAxis as number, | ||
| quantizeAxis: attributes.quantizeAxis as number, | ||
| }); |
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