code: public static long lengthOfBuffer(@NonNull long[] shape, @NonNull long[] stride){
          Preconditions.checkArgument(shape.length == stride.length, "Shape and strides must be same length: shape %s, stride %s",
                  shape, stride);
          //Length is simply 1 + the buffer index of the last element
          long length = 1;
          for(int i=0; i<shape.length; i++ ){
              length += (shape[i]-1) * stride[i];
          }
          return length;
      }
docs: Calculate the length of the buffer required to store the given shape with the given strides
  
  @param shape  Shape of the array
  @param stride Strides
  @return Length of the buffer