fix/improve hf to hf conversions
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.TH GGUF_TO_NVFP4_HF 1 "November 2026" "nvfp4_gguf_quant" "User Commands"
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.SH NAME
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gguf_to_nvfp4_hf \- convert and quantize GGUF models to NVFP4 Hugging Face format
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.SH SYNOPSIS
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.B gguf_to_nvfp4_hf
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[\fB\-o\fR \fIOUTPUT\fR]
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[\fB\-\-overwrite\fR]
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[\fB\-\-format\fR \fIFORMAT\fR]
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[\fB\-\-no\-quant\fR]
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[\fB\-\-outtype\fR \fITYPE\fR]
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[\fB\-\-output\-dtype\fR \fIDTYPE\fR]
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[\fB\-\-hf\-template\fR \fIDIR\fR]
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[\fB\-\-context\-length\fR \fILEN\fR]
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[\fB\-\-model\-name\fR \fINAME\fR]
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[\fB\-\-checkpoint\-dir\fR \fIDIR\fR]
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[\fB\-\-fresh\fR]
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[\fB\-\-keep\-checkpoints\fR]
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[\fB\-\-eager\fR]
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[\fB\-\-low\-memory\fR]
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[\fB\-\-heur\fR]
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[\fB\-\-verbose\fR]
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[\fB\-\-self\-test\fR]
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[\fB\-\-llama\-cpp\fR \fIPATH\fR]
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[\fB\-\-convert\-to\-quant\fR \fIPATH\fR]
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[\fB\-\-device\fR \fIDEVICE\fR]
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[\fB\-\-simple\fR]
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[\fB\-\-optimizer\fR \fIOPT\fR]
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[\fB\-\-num\-iter\fR \fIN\fR]
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[\fB\-\-lr\fR \fILR\fR]
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[\fB\-\-lr\-patience\fR \fIN\fR]
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[\fB\-\-lr\-min\fR \fIMIN\fR]
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[\fB\-\-lr\-schedule\fR \fISCHED\fR]
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[\fB\-\-scale\-optimization\fR \fIMODE\fR]
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[\fB\-\-scale\-refinement\-rounds\fR \fIN\fR]
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[\fB\-\-full\-matrix\fR]
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[\fB\-\-top\-p\fR \fIP\fR]
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[\fB\-\-min\-k\fR \fIK\fR]
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[\fB\-\-max\-k\fR \fIK\fR]
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[\fB\-\-early\-stop\-loss\fR \fILOSS\fR]
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[\fB\-\-early\-stop\-stall\fR \fISTALL\fR]
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[\fB\-\-target\-loss\fR \fITARGET\fR]
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[\fB\-\-early\-stop\-floor\-stall\fR \fIFLOOR\fR]
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[\fB\-\-calib\-samples\fR \fISAMPLES\fR]
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[\fB\-\-seed\fR \fISEED\fR]
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[\fB\-\-no\-bias\-correction\fR]
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[\fB\-\-quantize\-output\fR]
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[\fB\-\-exclude\fR \fIREGEX\fR]
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[\fB\-h\fR|\fB\-\-help\fR]
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\fIgguf\fR
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.SH DESCRIPTION
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.B gguf_to_nvfp4_hf
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converts a GGUF model file into a standard Hugging Face model directory
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(\fIconfig.json\fR + safetensors) with NVIDIA FP4 (NVFP4) quantized weights.
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.PP
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GGUF tensor names are reverse-mapped to canonical Hugging Face conventions
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(e.g., \fIblk.0.attn_q.weight\fR maps to \fImodel.layers.0.self_attn.q_proj.weight\fR),
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and RoPE permutations for Q and K are inverted.
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.PP
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If the source GGUF contains float or non-NVFP4 weights, 2D weight matrices are quantized
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using convert_to_quant's learned rounding (or simple round-to-grid with \fB\-\-simple\fR).
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If the source GGUF already contains NVFP4 super-blocks, they are unpacked and repacked
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into ModelOpt-compatible safetensors without loss of precision.
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.PP
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If \fB\-\-no\-quant\fR is specified, the model is dequantized to standard float format
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(\fI--outtype f32, f16, bf16, or auto\fR).
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.PP
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An optional reference Hugging Face model directory can be provided with \fB\-\-hf\-template\fR
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to copy exact upstream tokenizer files, special token maps, and configs. If omitted,
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synthesized configuration and tokenizer files are extracted directly from the GGUF metadata.
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.SH POSITIONAL ARGUMENTS
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.TP
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.I gguf
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Path to the input GGUF model file.
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.SH OPTIONS
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.SS Output & File Control
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.TP
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.BI \-o " " OUTPUT ", " \-\-output " " OUTPUT
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Output destination directory (default: \fI./<model-name>-NVFP4\fR, or \fI./<model-name>\fR with
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\fB\-\-no\-quant\fR and \fBauto\fR).
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.TP
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.B \-\-overwrite
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Overwrite existing files in the output directory without prompting.
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.TP
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.BI \-\-format " " {hf,modelopt,comfy}
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Safetensors layout format. \fBhf\fR (default) produces standard Hugging Face
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\fBcompressed-tensors\fR layout (\fI<name>.weight_packed\fR, \fI<name>.weight_scale\fR,
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and \fI<name>.weight_global_scale\fR) natively supported by Hugging Face transformers,
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vLLM, SGLang, and llama.cpp. \fBmodelopt\fR (or \fBcomfy\fR) produces raw tensors
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(\fI<name>.weight\fR, \fI<name>.weight_scale\fR, \fI<name>.weight_scale_2\fR, and \fI<name>.comfy_quant\fR).
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.TP
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.BI \-\-hf\-template " " DIR
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Reference Hugging Face model directory to copy config, tokenizer, and template files from.
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.TP
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.BI \-\-context\-length " " LEN
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Override the maximum sequence/context length recorded in \fIconfig.json\fR.
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.TP
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.BI \-\-model\-name " " NAME
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Override the model name.
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.SS Quantization Mode
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.TP
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.B \-\-no\-quant
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Skip learned rounding. Rewrites tensors as float weights.
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.TP
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.BI \-\-outtype " " {auto,f32,f16,bf16,nvfp4}
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Data type for tensors when \fB\-\-no\-quant\fR is used (default: \fBauto\fR).
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.TP
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.BI \-\-output\-dtype " " {bfloat16,float16}
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Data type used for unquantized 2D weights, layer norms, and embeddings (default: \fBbfloat16\fR).
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.TP
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.B \-\-simple
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Round weights directly onto the E2M1 grid without iterative learned rounding.
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.SS Optimization & Learning Rate
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.TP
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.BI \-\-optimizer " " {auto,prodigy,adamw,radam,original}
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Optimizer for learned rounding. \fBauto\fR selects Prodigy if installed, otherwise AdamW (default: \fBauto\fR).
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.TP
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.BI \-\-num\-iter " " N
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Maximum optimization iterations per weight matrix (default: 4000).
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.TP
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.BI \-\-lr " " LR
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Initial learning rate (default: 1.0).
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.TP
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.BI \-\-lr\-patience " " N
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Patience steps before decaying the learning rate (default: 5).
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.TP
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.BI \-\-lr\-min " " MIN
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Minimum learning rate floor (default: 1e-8).
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.TP
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.BI \-\-lr\-schedule " " {plateau,exponential,adaptive}
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Learning rate decay schedule (default: \fBplateau\fR).
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.TP
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.BI \-\-scale\-optimization " " {fixed,iterative,joint}
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Scale factor optimization strategy. \fBjoint\fR optimizes block scales simultaneously with codes (default: \fBjoint\fR).
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.TP
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.BI \-\-scale\-refinement\-rounds " " N
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Number of scale refinement passes when using iterative scale optimization (default: 2).
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.SS SVD Low-Rank Approximation
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.TP
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.B \-\-full\-matrix
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Perform full SVD instead of randomized low-rank SVD.
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.TP
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.BI \-\-top\-p " " P
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Cumulative energy threshold for singular value truncation (default: 0.2).
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.TP
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.BI \-\-min\-k " " K
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Minimum number of singular vectors retained (default: 128).
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.TP
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.BI \-\-max\-k " " K
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Maximum number of singular vectors retained (default: 1280).
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.SS Early Stopping
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.TP
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.BI \-\-target\-loss " " TARGET
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Stop optimization once reconstruction loss reaches this threshold (default: 1e-5). Set 0 to disable.
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.TP
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.BI \-\-early\-stop\-stall " " STALL
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Stop after this many steps without loss improvement (default: 2000).
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.TP
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.BI \-\-early\-stop\-floor\-stall " " FLOOR
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Stop after this many steps without improvement once learning rate reaches its floor (default: 64).
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.TP
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.BI \-\-early\-stop\-loss " " LOSS
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Early stopping absolute loss threshold (default: 5e-9).
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.SS Calibration & Bias Correction
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.TP
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.BI \-\-calib\-samples " " SAMPLES
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Number of random normal calibration samples used for bias error compensation (default: 3072).
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.TP
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.BI \-\-seed " " SEED
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Random seed for calibration data generation (default: 42).
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.TP
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.B \-\-no\-bias\-correction
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Leave bias tensors unaltered without applying calibration-based error correction.
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.SS Layer Selection
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.TP
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.B \-\-quantize\-output
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Also quantize the final language model head (\fIlm_head.weight\fR). By default, \fIlm_head\fR remains unquantized.
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.TP
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.BI \-\-exclude " " REGEX ", " \-\-exclude\-layers " " REGEX
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Regular expression matching tensor names that should remain unquantized in float format.
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.SS Checkpoints & Resuming
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.TP
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.BI \-\-checkpoint\-dir " " DIR
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Directory to store and load intermediate per-tensor quantization checkpoints.
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.TP
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.B \-\-fresh
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Delete existing per-tensor checkpoints before starting.
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.TP
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.B \-\-keep\-checkpoints
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Retain per-tensor checkpoints upon successful completion.
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.SS Execution & Environment
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.TP
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.BI \-\-device " " DEVICE
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Compute device: \fBauto\fR, \fBcpu\fR, \fBcuda\fR, or \fBcuda:N\fR (default: \fBauto\fR).
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.TP
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.B \-\-eager
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Load tensors eagerly into memory.
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.TP
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.B \-\-low\-memory
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Stream tensors sequentially to minimize memory footprint.
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.TP
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.B \-\-heur
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Skip layers that convert_to_quant's heuristic rejects.
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.TP
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.BI \-\-convert\-to\-quant " " PATH
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Path to convert_to_quant source checkout if not installed in Python environment.
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.TP
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.BI \-\-llama\-cpp " " PATH
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Path to llama.cpp source checkout (default: \fI~/llama.cpp\fR).
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.SS Diagnostics
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.TP
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.B \-\-verbose
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Enable detailed progress and debugging output.
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.TP
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.B \-\-self\-test
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Run GGUF-to-HF unpack and roundtrip self-test and exit.
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.TP
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.B \-h\fR, \fB\-\-help
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Show command-line help and exit.
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.SH EXAMPLES
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.PP
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Convert and quantize a GGUF model to NVFP4 HF format:
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.PP
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.nf
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.RS
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gguf_to_nvfp4_hf -o ./meta-llama-3.1-8b-nvfp4 ./meta-llama-3.1-8b.gguf
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.RE
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.fi
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.PP
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Convert GGUF to HF using an upstream HF repo as template for tokenizers:
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.PP
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.nf
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.RS
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gguf_to_nvfp4_hf --hf-template ./upstream-hf-dir -o ./output-hf-dir ./model.gguf
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.RE
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.fi
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.SH SEE ALSO
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.BR hf_to_nvfp4_hf (1),
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.BR hf_to_nvfp4_gguf (1),
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.BR gguf_to_nvfp4_gguf (1),
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.BR safetensors_to_nvfp4_gguf (1)
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