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dbaek111/
fastvlm-1.5b-mlx-fp16

Name: fastvlm-1.5b-mlx-fp16
Rating: 2.5 (5 reviews)

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fastvlm-1.5b-mlx-fp16

This repository contains an MLX-converted FastVLM checkpoint.

Model

Base model: apple/FastVLM-1.5B
Parameters: 1.5B
Precision: fp16
Approx. folder size: 3.8G

The checkpoint was converted from Apple FastVLM using the official FastVLM model export workflow and patched mlx-vlm.

Files

This repository should include:

config.json
MLX model weights
tokenizer files
fastvithd.mlpackage vision tower

Example Usage

bash

hf download dbaek111/fastvlm-1.5b-mlx-fp16 --local-dir ./fastvlm-1.5b-mlx-fp16

python -m mlx_vlm.generate \
  --model ./fastvlm-1.5b-mlx-fp16 \
  --image /path/to/your/image.jpg \
  --prompt "Explain the image." \
  --max-tokens 64 \
  --temp 0.0

Benchmark

Benchmarked on an Apple Silicon Mac with the patched FastVLM mlx-vlm workflow.

Task: pedestrian wayfinding captioning
Images: three local test images resized to 512px and 1024px long edge
Prompt: Describe what is visible for pedestrian wayfinding in one short sentence. Do not list categories. Do not mention anything you cannot see. Keep under 30 words.
Max tokens: 64
Temperature: 0.0
Timing: model loaded once per image set, then three images processed sequentially

Model Selection

Model	Size	Precision	Avg 512px	Avg 1024px	Load	Recommended use
fastvlm-0.5b-mlx-q4	819M	q4	0.338s	0.370s	2.82s	Smallest and fastest; rough real-time captions
fastvlm-0.5b-mlx-q8	1.1G	q8	0.419s	0.414s	2.57s	Fast, with richer captions than 0.5B q4
fastvlm-0.5b-mlx-fp16	1.6G	fp16	0.435s	0.421s	2.79s	Small FP16 baseline
fastvlm-1.5b-mlx-q4	1.4G	q4	0.447s	0.464s	2.65s	Best real-time balance for pedestrian wayfinding
fastvlm-1.5b-mlx-q8	2.2G	q8	0.552s	0.541s	2.68s	More detail while staying sub-second
fastvlm-1.5b-mlx-fp16	3.8G	fp16	0.636s	0.557s	3.08s	1.5B FP16 reference variant
fastvlm-7b-mlx-q4	4.9G	q4	1.263s	1.241s	3.04s	Best quality/latency tradeoff among 7B variants
fastvlm-7b-mlx-q8	8.0G	q8	1.497s	1.495s	3.85s	Higher precision 7B, slower than q4
fastvlm-7b-mlx-fp16	15G	fp16	1.834s	1.874s	45.48s	Full precision reference; expensive to load

Per-Image Timing

Each cell is img1 / img2 / img3 inference time in seconds.

Model	512px images	1024px images
fastvlm-0.5b-mlx-q4	0.318 / 0.353 / 0.343	0.374 / 0.370 / 0.366
fastvlm-0.5b-mlx-q8	0.393 / 0.465 / 0.400	0.424 / 0.387 / 0.431
fastvlm-0.5b-mlx-fp16	0.394 / 0.490 / 0.421	0.430 / 0.395 / 0.437
fastvlm-1.5b-mlx-q4	0.454 / 0.458 / 0.430	0.465 / 0.472 / 0.456
fastvlm-1.5b-mlx-q8	0.591 / 0.611 / 0.453	0.594 / 0.552 / 0.477
fastvlm-1.5b-mlx-fp16	0.701 / 0.709 / 0.496	0.520 / 0.635 / 0.516
fastvlm-7b-mlx-q4	1.161 / 1.330 / 1.297	1.081 / 1.343 / 1.298
fastvlm-7b-mlx-q8	1.364 / 1.639 / 1.487	1.341 / 1.712 / 1.432
fastvlm-7b-mlx-fp16	1.561 / 2.041 / 1.902	1.595 / 2.277 / 1.749

Compatibility

This is an MLX export of FastVLM for Apple Silicon Macs. It includes the CoreML FastViTHD vision tower as fastvithd.mlpackage.

This repository is not a standard PyTorch Transformers checkpoint and is not intended for vLLM, SGLang, or Linux GPU inference.

Notes

This is an MLX-converted derivative of Apple FastVLM.

Please refer to the original Apple FastVLM repository and model card for license and usage conditions.