Implements StackRnn: a cascaded/recurrent RBM where the visible layer at
each time step is the concatenation of the previous hidden state (context)
and the current sensory input — V[t] = [context | x_t]. Weights are
shared across time steps (RTRBM-style concatenation variant).
- stack_rnn.py: StackRnn with step(), reconstruct(), reset(), train(),
make_layer() factory; supports greedy layer-wise training over sequences
of shape (num_seq, T, sensory_size)
- test_rnn.py: single-layer, two-layer, and save/load tests
- moby_rnn.ipynb: character-level language model on Moby Dick; one-hot
encoding, clamped-Gibbs next-char prediction, free text generation,
hidden-state trace and character-distribution visualisations
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
