Experimenting with Sparse Init 1.1

The receptive fields for the first attempt were almost empty at 1000
trials. 5000 trials might allow the receptive fields to learn something
even with sparse initialization.
Revert "Experimenting with Sparse Init 1.1"

This reverts commit e20319e8f22151e76f2a9b7d37d67395e2f8034c.