keras-js/lib/layers/advanced_activations/LeakyReLU.js

Run Keras models in the browser, with GPU support using WebGL

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _Layer = _interopRequireDefault(require("../../Layer"));

var _Tensor = _interopRequireDefault(require("../../Tensor"));

var _WebGL = require("../../WebGL2");

var _activations = require("../../activations");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const programSource = "#version 300 es\nprecision highp float;\n\nin vec2 outTex;\nuniform sampler2D x;\nuniform float alpha;\nout vec4 outColor;\n\nvoid main() {\n  vec4 v = texture(x, vec2(outTex.x, outTex.y));\n  outColor = max(v, 0.0) + alpha * min(v, 0.0);\n}\n";

class LeakyReLU extends _Layer.default {
  constructor(attrs = {}) {
    super(attrs);
    this.layerClass = 'LeakyReLU';
    const {
      alpha = 0.3
    } = attrs;
    this.description = `alpha: ${alpha}`;
    this.alpha = alpha;

    if (this.gpu) {
      this.program = _WebGL.webgl2.compileProgram(programSource);
    }
  }

  call(x) {
    if (this.gpu) {
      this._callGPU(x);
    } else {
      this._callCPU(x);
    }

    return this.output;
  }

  _callCPU(x) {
    this.output = x;
    (0, _activations.relu)(this.output, {
      alpha: this.alpha
    });
  }

  _callGPU(x) {
    if (!x.glTexture && !x.glTextureFragments) {
      x.createGLTexture({
        type: '2d',
        format: 'float',
        supportsTextureFragments: true
      });
    }

    if (!this.output) {
      this.output = new _Tensor.default([], x.glTextureShape);
      this.output.createGLTexture({
        type: '2d',
        format: 'float',
        supportsTextureFragments: true
      });

      if (x.is1D) {
        this.output.is1D = x.is1D;
      } else if (x.is2DReshaped || x.is2DSquareReshaped) {
        if (x.is2DReshaped) {
          this.output.is2DReshaped = x.is2DReshaped;
        } else if (x.is2DSquareReshaped) {
          this.output.is2DSquareReshaped = x.is2DSquareReshaped;
        }

        this.output.originalShape = x.originalShape;
        this.output.indicesForReshaped = x.indicesForReshaped;
      }
    }

    _WebGL.webgl2.runProgram({
      program: this.program,
      output: this.output,
      inputs: [{
        input: x,
        name: 'x'
      }],
      uniforms: [{
        value: this.alpha,
        type: 'float',
        name: 'alpha'
      }],
      supportsTextureFragments: true
    });

    if (this.outbound.length === 0) {
      this.output.transferFromGLTexture();

      if (this.output.is2DReshaped) {
        this.output.reshapeFrom2D();
      } else if (this.output.is2DSquareReshaped) {
        this.output.reshapeFrom2DSquare();
      }
    }
  }

}

exports.default = LeakyReLU;