Class UnaryOpProgram

tfjs-backend-webgpu/src/unary_op_webgpu.ts:22–61

import {computeDispatch, flatDispatchLayout} from './webgpu_util';

export class UnaryOpProgram implements WebGPUProgram {
  outputShape: number[];
  shaderKey: string;
  dispatchLayout: {x: number[]};
  dispatch: [number, number, number];
  variableNames = ['A'];
  workgroupSize: [number, number, number];
  op: UnaryOpType;
  uniforms?: string;
  size = true;

  constructor(outputShape: number[], op: UnaryOpType, uniforms = '') {
    // TODO(jiajia.qin@intel.com): Heuristically select a good work group size.
    const workgroupSizeX = 128;
    this.workgroupSize = [workgroupSizeX, 1, 1];
    this.outputShape = outputShape;
    this.dispatchLayout = flatDispatchLayout(this.outputShape);
    this.dispatch = computeDispatch(
        this.dispatchLayout, this.outputShape, this.workgroupSize);
    this.op = op;
    if (uniforms !== '') {
      this.uniforms = uniforms;
    }
    this.shaderKey = `unary_${op}`;
  }

  getUserCode(): string {
    return `
      fn unaryOperation(a : f32) -> f32 {
        ${getUnaryOpString(this.op, false)}
      }
      ${main('index')} {
        if (index < uniforms.size) {
          let a = getAByOutputIndex(index);
          setOutputAtIndex(index, unaryOperation(a));
        }
      }
      `;
  }
}