README

Signed-off-by: Shengliang Xu <shengliangx@nvidia.com>

Author: shengliangxu

modelopt_recipes/configs/ptq/units/README.md

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+# PTQ Config Units
+
+Reusable building blocks for composing PTQ quantization configurations.
+Each file defines one or more `quant_cfg` entries that can be imported
+into recipes or presets via `$import`.
+
+Units are **not** standalone configs — they don't have `algorithm` or
+`metadata`. They are meant to be composed into complete configs by
+recipes (under `general/` or `models/`) or presets (under `presets/`).
+
+| File | Description |
+|------|-------------|
+| `base_disable_all.yaml` | Deny-all entry: disables all quantizers as the first step |
+| `default_disabled_quantizers.yaml` | Standard exclusions (LM head, routers, BatchNorm, etc.) |
+| `fp8_kv.yaml` | FP8 E4M3 KV cache quantizer entry |
+| `w8a8_fp8_fp8.yaml` | FP8 weight + activation quantizer entries (W8A8) |
+| `w4a4_nvfp4_nvfp4.yaml` | NVFP4 weight + activation quantizer entries (W4A4) |