NVIDIA Nemotron Nano 2: An Accurate and Efficient Hybrid Mamba-Transformer Reasoning Model
Paper
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2508.14444
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Published
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40
Andrey
Bochkov
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New REPL environment in OpenEnv available! ✨
Used in the Recursive Language Models (RLM) paper by Alex Zhang.
Ready for inference & post-training using trajectories. Handles long contexts:
> Run Python code in a sandbox
> Make recursive calls to LMs
> Explore data programmatically
> Return final result
Docs: https://meta-pytorch.org/OpenEnv/environments/repl/
Inference script: https://github.com/meta-pytorch/OpenEnv/blob/main/examples/repl_oolong_simple.py
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7 days ago
Curious reproducible fact: I trained a GPT-like decoder-only Transformer where the entire input embedding table is frozen and reduced to a 16‑D binary token-ID code (0/1) — this is NOT 16-bit quantization.
Key details:
- vocab_size = 65536, n_embed = 16 (2^16 = 65536 unique IDs)
- deterministic expansion 16 → d_model=1024 via repeat_interleave (scale=64)
- full embedding table is published (embeddings.txt) for auditability
Repro note + verification script:
https://huggingface.co/blog/Bochkov/emergent-semantics-beyond-token-embeddings
Model repo:
https://huggingface.co/Bochkov/emergent-semantics-model-16-bit-269m
License: Apache-2.0
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