Code to parse MNIST Binary Buffer for Training

tfjs-blog-parse-mnist-binary.js

static parseBuffer(buffer, offset = 16, isBigEndianProcessor = false) {
    let allData = null;
    if (isBigEndianProcessor) {
        // Let native JavaScript decode the bytes as MNIST dataset is encoded in Big Endian format 
        allData = new Uint8Array(buffer, offset)
    }
    else {
        const dataView = new DataView(buffer);
        const numBytes = dataView.byteLength - offset;
        allData = new Uint8Array(numBytes);
        for (let i = offset, j = 0; i < numBytes; i++ , j++) {
            allData[j] = dataView.getUint8(i, isBigEndianProcessor);
        }
    }
    return allData;
}