jensandClaude Sonnet 5
cb20060732
Rbm::Params had no l1Lambda field at all -- L1 didn't exist anywhere in the C++ codebase. Status::L1 was a dead field always -1 (never assigned outside its constructor), and the GUI's "Lambda" control was explicitly tooltipped "Unused" with an empty change-handler stub. Scaffolded, never implemented. Add Params::l1Lambda (default 0.0, inert unless set) with full toJson/ fromJson round-trip. Apply its subgradient (lambda*sign(W), matching pyRBM's l1_lambda) directly to m_whv in Rbm::train, in the same place and same decoupled-from-momentum manner as the weightDecay fix from the previous commit -- folding it into inc_whv's momentum recursion would cause the same momentum-amplification bug. Doesn't touch the biases, matching pyRBM's state_adjust(). Also wire up Status::L1 to actually report something (the current L1 norm of the weights, sum(abs(W))) instead of permanently printing -1, computed alongside status.err/err_total. Inert by default (l1Lambda=0.0 in every existing .prj): confirmed via unchanged poet.elf output and unchanged test-suite results (9 passed, 1 known issue, 2 failed). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016K8Gu7Qejd11JbdiHZqYAs