Numpy binary files (NPY, NPZ)
load(file[, mmap_mode, allow_pickle, ...]) Load arrays or pickled objects from .npy, .npz or pickled files.
save(file, arr[, allow_pickle, fix_imports]) Save an array to a binary file in NumPy .npy format.
savez(file, *args, **kwds) Save several arrays into a single file in uncompressed .npz format.
savez_compressed(file, *args, **kwds) Save several arrays into a single file in compressed .npz format.
The format of these binary file types is documented in h