Suppose:

1. we are computing the Bag of Visual Words (BoVW) vector from an image;
2. we computed 1517 descriptors (represented each by 128 integers) for this image;
3. our codebook contains 256 elements;
4. each element in our BoVW vector is represented by a float32 (4 bytes).

What is the size in bytes of the BoVW vector for this image (right after the encoding step, with the simplest possible pooling)?