Structured execution for manipulation VLAs
Several papers make VLA policies easier to run as long-horizon controllers. PrimitiveVLA cuts demonstrations into 11 reusable primitives and plans primitive sequences at test time; it reports OpenVLA success rising to 45.50% on LIBERO-90-Novel and pi0.5 success reaching 80.25% on LIBERO-Long. ProgVLA uses a 0.1B-parameter policy with compressed multimodal tokens and progress heads, reaching 91.1% average LIBERO success and 68% real-world success over 100 PiPER-arm trials. A separate probing study finds that frozen VLA features already contain a value-like success signal, then uses a linear probe to select among Pi0.5 action chunks, improving pooled hard-3 success to 42.44% against 31.11% for greedy decoding.