February 2026 (2026-02) monthly summary for volcengine/verl focusing on stability improvements and a critical bug fix in the gpt_model_forward_no_padding path associated with loss_mask handling in logits_processor_args. No new user-facing features were delivered this month; the primary contribution was a robust fix to prevent a crash and improve forward-path reliability for the Megatron Engine with Value Head. The change includes a defensive guard and was co-authored by albertyi, enhancing code safety and maintainability. This work strengthens production reliability for forward passes, reducing downtime risk and supporting downstream services.

January 2026 monthly summary for volcengine/verl focusing on reliability and throughput in dynamic micro-batching. Implemented a robust fix for dynamic micro-batch workload calculation by upcasting seq_len_effective to int64 in rearrange_micro_batches. This prevents overflow in calculate_workload when using dynamic batch sizes, thereby avoiding potential negative workloads and stabilizing the micro-batch processing pipeline. Key validation included a PoC-driven sanity check and comprehensive commit notes, ensuring the change remains isolated to dtype handling without affecting core computation logic. Overall impact: improved stability, safer dynamic batching at scale, and reduced production risk in training workloads. Tech debt addressed in seqlen_balancing and training utilities, improving maintainability and future scalability.