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Time series forecasting: 9 quantiles (0.1–0.9), 64 future steps, context up to 2048 observations. No text tokenizer.
Conversion of amazon/chronos-bolt-small at revision 772f3d25d38aec6d914c8949dab4462e2d46f5d8. No fine-tuning or replacement checkpoint. F32 baseline, not a 4-bit quantization. Original authors retain credit and license rights.
Custom GGUF schema: general.architecture=hf-native-mlx-v1, original HF tensor names, F32 tensors. Use the included MLX loader. This is not a llama.cpp/Ollama/LM Studio-compatible GGUF, and is not advertised as such. The container preserves all tensors used by the source inference model.
Apple Silicon Mac required by the included MLX runtime. Inputs may vary in length (up to the source limit); compiled Apple exports below use fixed shapes.
pip install huggingface_hub mlx numpy gguf
from huggingface_hub import snapshot_download
from pathlib import Path
import sys, numpy as np
path = snapshot_download("masahiroid/chronos-bolt-small-gguf")
sys.path.insert(0, path)
from runtime_mlx import Model
model = Model(path, gguf=True)
forecast = model(context=np.arange(2048, dtype=np.float32)[None, :])
print(np.array(forecast).shape) # (1, 9, 64)
Compared against the original PyTorch implementation, 3 deterministic cases. Maximum absolute output difference: 3.8146973e-06; minimum cosine similarity: 1. See validation.json for each case. These are conversion parity checks, not a full task-quality benchmark or latency benchmark.
Text tests cover English emotions, neutral retrieval text, Japanese, empty input and truncation. Chronos tests cover a trend plus sinusoid, a constant series and a series with missing observations. Only applicable tests are used for each model.
Core ML/Core AI text exports use batch 1 and sequence length 128; tokenization must pad/truncate to 128. Chronos Apple exports use batch 1 and context length 2048. MLX/custom GGUF preserve the original maximum context rather than adding training. Short Chronos inputs can be left-padded with NaN for the fixed Apple exports. Forecast horizon remains 64.
Source revision and output semantics: provenance.json. Conversion scripts are included. Reproduce in a checkout with sources/<original-model-name>/, sources.json and publish/ directories as in the scripts. PyTorch 2.14.1; Transformers 4.57.3; MLX 0.32.4; NumPy 1.26.4 (MLX/Core ML environment); coremltools 9.0; chronos-forecasting 2.3.2; GGUF 0.19.0; Core AI export uses coreai-torch 0.4.3. Core AI validation uses its separate Python 3.14 environment. Version compatibility outside the tested environment is not guaranteed.
Weights remain under apache-2.0, with upstream terms in LICENSE. Converter/runtime additions are MIT licensed (CODE_LICENSE). No new task training, safety certification or commercial license is implied.
amazon/chronos-bolt-small