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[bug] nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-NVFP4 can not be imported/converted to Megatron format

bugSomething isn't workingSomething isn't working

Status: Open.

#3605 In NVIDIA-NeMo/Megatron-Bridge;

· OlegSudakov opened on Apr 30, 2026

[bug] Nemotron 3 Super NVFP4 pretraining with HybridEP fails with "Assertion `args.output_tokens_ptr != nullptr' failed in 26.04.00"

bugSomething isn't workingSomething isn't working

needs-triageNew item needs classification and ownershipNew item needs classification and ownership

Status: Open.

#3599 In NVIDIA-NeMo/Megatron-Bridge;

· OlegSudakov opened on Apr 30, 2026

[bug] OOM observed with fp4_param_gather=true for "DEEPSEEK_V3_PRETRAIN_CONFIG_B200_NVFP4_V2"

area:perfPerformance optimizations and benchmarkingPerformance optimizations and benchmarking

bugSomething isn't workingSomething isn't working

needs-triageNew item needs classification and ownershipNew item needs classification and ownership

Status: Open.

Bug

#3597 In NVIDIA-NeMo/Megatron-Bridge;

· malay-nagda opened on Apr 30, 2026

[bug] Preraining requires more memory after restoring from checkpoint (26.04.00)

bugSomething isn't workingSomething isn't working

needs-triageNew item needs classification and ownershipNew item needs classification and ownership

Status: Open.

#3576 In NVIDIA-NeMo/Megatron-Bridge;

· OlegSudakov opened on Apr 29, 2026

[bug] There seems to be a consistent increase in CPU memory while using MBridge

bugSomething isn't workingSomething isn't working

community-request

waiting-on-customerWaiting on the original author to respondWaiting on the original author to respond

Status: Open.

#3555 In NVIDIA-NeMo/Megatron-Bridge;

· harishankar-gopalan opened on Apr 28, 2026

[determinism] [feature] DSV4 Determinism Kernel Level Optimization

DeterminismTo track the bugs/issues in deterministic training in Megatron-Bridge.To track the bugs/issues in deterministic training in Megatron-Bridge.

featureNew capabilities, enhancements, or enablement workNew capabilities, enhancements, or enablement work

trackingTracking issue for an ongoing project with smaller stepsTracking issue for an ongoing project with smaller steps

Status: Open.

#3538 In NVIDIA-NeMo/Megatron-Bridge;

· ZhiyuLi-Nvidia opened on Apr 27, 2026

[bug] CUDA Graphs Hang in MoE Token Dispatcher

bugSomething isn't workingSomething isn't working

community-request

Status: Open.

#3517 In NVIDIA-NeMo/Megatron-Bridge;

· ngu3 opened on Apr 24, 2026

[bug] Quantization fails for Nemotron-3-Super in multinode setup

bugSomething isn't workingSomething isn't working

community-request

waiting-on-customerWaiting on the original author to respondWaiting on the original author to respond

Status: Open.

#3499 In NVIDIA-NeMo/Megatron-Bridge;

· soonchang-ytlailabs opened on Apr 23, 2026

[Bug] VLM TFLOPS calculation is inaccurate: uses config seq_length instead of actual FA sequence length, and omits ViT encoder FLOPs

bugSomething isn't workingSomething isn't working

community-request

waiting-on-maintainersWaiting on maintainers to respondWaiting on maintainers to respond

Status: Open.

#3498 In NVIDIA-NeMo/Megatron-Bridge;

· SophusDavid opened on Apr 23, 2026

Pass full_param_layout into DDP (Megatron-LM #3812)

mlm-syncRequires API/behavior sync with upstream Megatron-LM changesRequires API/behavior sync with upstream Megatron-LM changes

trackingTracking issue for an ongoing project with smaller stepsTracking issue for an ongoing project with smaller steps

Status: Open.

#3483 In NVIDIA-NeMo/Megatron-Bridge;

· yaoyu-33 opened on Apr 22, 2026

[bug] DeepSeek-V3 fails with profiling enabled

bugSomething isn't workingSomething isn't working

Status: Open.

#3475 In NVIDIA-NeMo/Megatron-Bridge;

· scsudhakaran opened on Apr 22, 2026

[support] SFT config recipe for different hardware (H100 instead of B200) to tune Nemotron-3-super

waiting-on-customerWaiting on the original author to respondWaiting on the original author to respond

Status: Open.

#3463 In NVIDIA-NeMo/Megatron-Bridge;

· pthongpramoo opened on Apr 22, 2026