Q-TensorFormer / CHECKPOINT_COMPATIBILITY.md
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fix(config): Align configuration API with canonical ModelConfig fields and document checkpoint provenance
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CHECKPOINT COMPATIBILITY: Audit of qtensorformer_small.pt

Date: September 17, 2026
Status: CHECKPOINT_INCOMPATIBLE


1. Executive Summary

Evaluation of the binary checkpoint qtensorformer_small.pt under mandatory strict loading (load_state_dict(..., strict=True)) confirmed that the checkpoint cannot be loaded into current Q-TensorFormer models.

2. Incompatibility Matrix

Target Architecture Strict Load Status Missing Keys Count Unexpected Keys Count Primary Root Cause
src.models.QTensorFormer FAILED 185 113 Architecture mismatch: Checkpoint uses TensorLy factorized FFN and LM head
q_tensor_former.QTensorFormer FAILED 101 113 Namespace & architecture mismatch: Checkpoint uses blocks.* and factorized weights
q_tensor_former_v2.QTensorFormer FAILED 107 113 Namespace & architecture mismatch: Checkpoint uses external TensorLy layers

3. Scientific Policy

  1. No keys were renamed arbitrarily to force a synthetic pass.
  2. strict=False was not used to hide weight mismatches.
  3. Track A benchmarks must acknowledge CHECKPOINT_INCOMPATIBLE honestly rather than hallucinating compatibility.