OpenAI-NEO-CODE-20B - Q4NX for FastFlowLM (AMD Ryzen AI XDNA2)
A code-focused GPT-OSS-20B fine-tune, converted to Q4NX for FastFlowLM.
What is Q4NX?
Q4NX is FastFlowLM's native packed-quantization format - in the case of GPT-OSS
a rearranged Q4_1-Q4NX layout tuned for the NPU matrix engine's tile sizes and
memory access patterns. It is
not
a GGUF file and it does not run on
llama.cpp or Ollama; it is meant exclusively for the
FastFlowLM
engine on AMD Ryzen AI NPUs.
Requirements
FastFlowLM >= 0.9.45 (
flm
CLI)
AMD Ryzen AI processor with
XDNA2 (NPU2)
- Strix Point / Ryzen AI 300
series or later
Linux with the XRT NPU stack installed
~16 GB of unified system memory (Q4NX weights + activations + KV cache)
Files
File
Purpose
model.q4nx
Quantized Q4NX weights
config.json
FastFlowLM model configuration
tokenizer.json
Tokenizer
tokenizer_config.json
Special tokens and chat template
chat_template.jinja
Chat template (optional)
flm-add.py
Installer script - registers this model with FastFlowLM
Install and run
This repository ships
flm-add.py
, a small installer that copies the model
into the FastFlowLM user directory and registers the tag. It never
modifies the system FastFlowLM install.
Run
python3 ./flm-add.py --help
for all options. Without a clone, the same
command works against the repo id directly:
FastFlowLM's NPU kernels (xclbins) are closed source and are not shipped in
this repository.
flm-add.py
links the kernels of the official
gpt-oss:8b
model (
GPT-OSS-20B-NPU2
), because this model shares the same engine family
(
gpt-oss
) and architecture.
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