code: public static INDArray fromNpyBase64(String base64) {
          byte[] bytes = Base64.decodeBase64(base64);
          return Nd4j.createNpyFromByteArray(bytes);
      }
docs: Convert a numpy array from base64
  to a byte array and then
  create an {@link INDArray}
  from {@link Nd4j#createNpyFromByteArray(byte[])}
  @param base64 the base 64 byte array
  @return the created {@link INDArray}