"""
@todo: Make a layer class, with standardized names:
    input, cost, lr, and update
(a Method called update, to be more precise, whose first argument is the input)

input_dimension, output_dimension (aliased as nin and nout)

Modules like pylearn.algorithms.logistic_regression.Module_Nclass and
pylearn.algorithms.???.Bin_Regressor should inherit from Layer and
Stacker should assume Layer.
"""