Definition. Controlled post-training experiment cell [ftip-009T]
Definition. Controlled post-training experiment cell [ftip-009T]
A controlled post-training experiment cell is a record
\[ \mathfrak c= (M,\pi ^{\mathrm {init}},\mathsf T,\mathcal D_{\mathrm {tr}}, r^{\mathrm {id}},\mathcal A,b_{\mathrm {tr}},\mathsf E), \]where \(M\) identifies the model architecture and checkpoint lineage, \(\pi ^{\mathrm {init}}\) is its starting policy, \(\mathsf T\) is the task, \(\mathcal D_{\mathrm {tr}}\) is the training-prompt law, \(r^{\mathrm {id}}\) identifies an executable reward rule and version, \(\mathcal A\) is the update procedure, \(b_{\mathrm {tr}}\) is the training budget, and \(\mathsf E\) is the evaluation interface. Random seeds and hyperparameters belong to the relevant record fields even when suppressed from the notation.
[clay2026demystifying, Figure 1 and Sections 4.1--4.3] motivates the coordinates. The source varies starting distribution, prompt distribution, and reward while using a common broad RL setup. Because its main-text and Appendix-C sparse rewards differ, the reward field is an identifier for an executable rule, not merely the word ``sparse.''