face-api/src/faceFeatureExtractor/extractParams.ts

import { extractWeightsFactory, ParamMapping } from '../common/index';
import { extractorsFactory } from './extractorsFactory';
import { FaceFeatureExtractorParams } from './types';

export function extractParams(weights: Float32Array): { params: FaceFeatureExtractorParams, paramMappings: ParamMapping[] } {
  const paramMappings: ParamMapping[] = [];

  const {
    extractWeights,
    getRemainingWeights,
  } = extractWeightsFactory(weights);

  const {
    extractDenseBlock4Params,
  } = extractorsFactory(extractWeights, paramMappings);

  const dense0 = extractDenseBlock4Params(3, 32, 'dense0', true);
  const dense1 = extractDenseBlock4Params(32, 64, 'dense1');
  const dense2 = extractDenseBlock4Params(64, 128, 'dense2');
  const dense3 = extractDenseBlock4Params(128, 256, 'dense3');

  if (getRemainingWeights().length !== 0) {
    throw new Error(`weights remaing after extract: ${getRemainingWeights().length}`);
  }

  return {
    paramMappings,
    params: {
      dense0, dense1, dense2, dense3,
    },
  };
}