ENH Prevent memory copying in RBM's _fit
Do not touch uncopied memory
RBM example now verbose
squeezing logistic_sigmoid result only on 1D arrays
adding a test for sparse matrices in RBM
changing free_energy to private in RBM
added neural_network to setup
Nudge images using convolve, slower but more readable
Clarify narrative docs
Clarify and python3 RBM example
Periods and other docstring issues
MISC: remove unecessary dtype

With the cast in check_arrays, this works even with 'safe casting' numpys
Remove redundant test
Python3 support in RBM
TST RBM smoke-test verbosity
Add a copy parameter to safe_asarray()
Merge branch 'pr/1954'

Fixes #1954.
MAINT _logistic_sigmoid.c is "binary"
cosmit : protect attributes in RBM for sphinx
Imp readability