[feat] data exploration utils

[edgarriba]

• compute_std_mean
• compute_histrogram
• put examples to load a large directory and compute averaged std/mean and histograms
• make_tiles (create a grid image)
• show in rerun

[johnnv1]

about make tiles... Do you think something like

for a given tensor, x_size, y_size, overlapping_x, overlapping_y, generate a list/array/whatever of tiles?

[edgarriba]

something like: https://keras.io/examples/vision/visualizing_what_convnets_learn/ however now tensorboard, visdom or other visualizers they support already to give a batch and make that for you. So not sure if makes a lot of sense to add this functionality here.