text: /* eslint-disable */
  /**
   * @file io，loader相关输入输出
   * @author wangqun@baidu.com
   */
  export default class io {
      constructor() {
          this.fromPixels2DContext = document.createElement('canvas').getContext('2d');
      };
  
      fromPixels(pixels, opt) {
          pixels = pixels.input;
          const shape = opt[0].shape;
          const numChannels = opt[0].shape[0];
          if (pixels == null) {
              throw new Error(
                  'pixels passed to tf.browser.fromPixels() can not be null');
          }
          let vals;
          // tslint:disable-next-line:no-any
          // tslint:disable-next-line:no-any
          if (pixels.getContext != null) {
              // tslint:disable-next-line:no-any
              vals = pixels
                  .getContext('2d')
                  .getImageData(0, 0, pixels.width, pixels.height)
                  .data;
          } else if (pixels instanceof ImageData) {
              vals = pixels.data;
          } else if (
              pixels instanceof HTMLImageElement ||
              pixels instanceof HTMLVideoElement) {
              if (this.fromPixels2DContext == null) {
                  throw new Error(
                      'Can\'t read pixels from HTMLImageElement outside ' +
                      'the browser.');
              }
              this.fromPixels2DContext.canvas.width = pixels.width;
              this.fromPixels2DContext.canvas.height = pixels.height;
              this.fromPixels2DContext.drawImage(
                  pixels, 0, 0, pixels.width, pixels.height);
              vals = this.fromPixels2DContext
                  .getImageData(0, 0, pixels.width, pixels.height)
                  .data;
          } else {
  
          }
          let values;
          if (numChannels === 4) {
              values = new Array(vals);
          } else {
              const numPixels = (shape[1] || pixels.width) * (shape[2] ||pixels.height);
              // console.log(numPixels, numPixels * numChannels);
              values = new Array(numPixels * numChannels);
              for (let i = 0; i < numPixels; i++) {
                  for (let channel = 0; channel < numChannels; ++channel) {
                      values[i * numChannels + channel] = vals[i * 4 + channel];
                  }
              }
          }
          // console.log(pixels.height, pixels.width, numChannels, values);
          // const outShape: [number, number, number] =
          //     [pixels.height, pixels.width, numChannels];
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          return [{data: values, shape: shape, name: 'pixel'}];
      }
  }
  /* eslint-enable */
  