Function loadImages

mnist-node/data.js:72–97

(filename)

}

async function loadImages(filename) {
  const buffer = await fetchOnceAndSaveToDiskWithBuffer(filename);

  const headerBytes = IMAGE_HEADER_BYTES;
  const recordBytes = IMAGE_HEIGHT * IMAGE_WIDTH;

  const headerValues = loadHeaderValues(buffer, headerBytes);
  assert.equal(headerValues[0], IMAGE_HEADER_MAGIC_NUM);
  assert.equal(headerValues[2], IMAGE_HEIGHT);
  assert.equal(headerValues[3], IMAGE_WIDTH);

  const images = [];
  let index = headerBytes;
  while (index < buffer.byteLength) {
    const array = new Float32Array(recordBytes);
    for (let i = 0; i < recordBytes; i++) {
      // Normalize the pixel values into the 0-1 interval, from
      // the original 0-255 interval.
      array[i] = buffer.readUInt8(index++) / 255;
    }
    images.push(array);
  }

  assert.equal(images.length, headerValues[1]);
  return images;
}

async function loadLabels(filename) {
  const buffer = await fetchOnceAndSaveToDiskWithBuffer(filename);