Improve model card: add detailed overview, usage, model zoo, and correct license

README.md

@@ -1,12 +1,158 @@
 ---
-license: apache-2.0
+license: mit
 pipeline_tag: time-series-forecasting
 tags:
 - Finance
 - Candlestick
 - K-line
+- time-series
 ---
-# Model Card for Kronos
 
+# Kronos: A Foundation Model for the Language of Financial Markets
 
-For details on how to use this model, please visit our [GitHub page](https://github.com/shiyu-coder/Kronos).
+**Kronos** is a unified, scalable pre-training framework tailored to financial K-line (candlestick) modeling. It introduces a specialized tokenizer that discretizes continuous market information into token sequences, preserving both price dynamics and trade activity patterns. Kronos is pre-trained using an autoregressive objective on a massive, multi-market corpus of over 12 billion K-line records from 45 global exchanges, enabling it to learn nuanced temporal and cross-asset representations.
+
+Kronos excels in a zero-shot setting across a diverse set of financial tasks. On benchmark datasets, Kronos boosts price series forecasting RankIC by 93% over the leading Time Series Foundation Model (TSFM) and 87% over the best non-pre-trained baseline. It also achieves a 9% lower MAE in volatility forecasting and a 22% improvement in generative fidelity for synthetic K-line sequences. These results establish Kronos as a robust, versatile foundation model for end-to-end financial time series analysis.
+
+For more details, refer to our paper: [Kronos: A Foundation Model for the Language of Financial Markets](https://huggingface.co/papers/2508.02739).
+
+Live Demo: [Kronos Live Demo](https://shiyu-coder.github.io/Kronos-demo/)
+Code: [GitHub Repository](https://github.com/shiyu-coder/Kronos)
+
+<p align="center">
+    <img src="https://github.com/shiyu-coder/Kronos/raw/main/figures/overview.png" alt="Kronos Overview" align="center" width="700px" />
+</p>
+
+## Introduction
+
+Kronos is the **first open-source foundation model** for financial candlesticks (K-lines), trained on data from over **45 global exchanges**.
+
+Kronos is a family of decoder-only foundation models, pre-trained specifically for the "language" of financial markets—K-line sequences. Unlike general-purpose TSFMs, Kronos is designed to handle the unique, high-noise characteristics of financial data. It leverages a novel two-stage framework:
+1.  A specialized tokenizer first quantizes continuous, multi-dimensional K-line data (OHLCV) into **hierarchical discrete tokens**.
+2.  A large, autoregressive Transformer is then pre-trained on these tokens, enabling it to serve as a unified model for diverse quantitative tasks.
+
+## Model Zoo
+We release a family of pre-trained models with varying capacities to suit different computational and application needs. All models are readily accessible from the Hugging Face Hub.
+
+| Model        | Tokenizer                                                                       | Context length | Param  | Open-source                                                               |
+|--------------|---------------------------------------------------------------------------------| -------------- | ------ |---------------------------------------------------------------------------|
+| Kronos-mini  | [Kronos-Tokenizer-2k](https://huggingface.co/NeoQuasar/Kronos-Tokenizer-2k)     | 2048           | 4.1M   | ✅ [NeoQuasar/Kronos-mini](https://huggingface.co/NeoQuasar/Kronos-mini)  |
+| Kronos-small | [Kronos-Tokenizer-base](https://huggingface.co/NeoQuasar/Kronos-Tokenizer-base) | 512            | 24.7M  | ✅ [NeoQuasar/Kronos-small](https://huggingface.co/NeoQuasar/Kronos-small) |
+| Kronos-base  | [Kronos-Tokenizer-base](https://huggingface.co/NeoQuasar/Kronos-Tokenizer-base) | 512            | 102.3M | ✅ [NeoQuasar/Kronos-base](https://huggingface.co/NeoQuasar/Kronos-base)   |\
+| Kronos-large | [Kronos-Tokenizer-base](https://huggingface.co/NeoQuasar/Kronos-Tokenizer-base) | 512            | 499.2M | ❌                                                                         |
+
+## Getting Started
+
+### Installation
+
+1.  Install Python 3.10+, and then install the dependencies:
+
+```shell
+pip install -r requirements.txt
+```
+
+### Making Forecasts
+
+Forecasting with Kronos is straightforward using the `KronosPredictor` class. It handles data preprocessing, normalization, prediction, and inverse normalization, allowing you to get from raw data to forecasts in just a few lines of code.
+
+**Important Note**: The `max_context` for `Kronos-small` and `Kronos-base` is **512**. This is the maximum sequence length the model can process. For optimal performance, it is recommended that your input data length (i.e., `lookback`) does not exceed this limit. The `KronosPredictor` will automatically handle truncation for longer contexts.
+
+Here is a step-by-step guide to making your first forecast.
+
+#### 1. Load the Tokenizer and Model
+
+First, load a pre-trained Kronos model and its corresponding tokenizer from the Hugging Face Hub.
+
+```python
+from model import Kronos, KronosTokenizer, KronosPredictor
+
+# Load from Hugging Face Hub
+tokenizer = KronosTokenizer.from_pretrained("NeoQuasar/Kronos-Tokenizer-base")
+model = Kronos.from_pretrained("NeoQuasar/Kronos-small")
+```
+
+#### 2. Instantiate the Predictor
+
+Create an instance of `KronosPredictor`, passing the model, tokenizer, and desired device.
+
+```python
+# Initialize the predictor
+predictor = KronosPredictor(model, tokenizer, device="cuda:0", max_context=512)
+```
+
+#### 3. Prepare Input Data
+
+The `predict` method requires three main inputs:
+-   `df`: A pandas DataFrame containing the historical K-line data. It must include columns `['open', 'high', 'low', 'close']`. `volume` and `amount` are optional.
+-   `x_timestamp`: A pandas Series of timestamps corresponding to the historical data in `df`.
+-   `y_timestamp`: A pandas Series of timestamps for the future periods you want to predict.
+
+```python
+import pandas as pd
+
+# Load your data
+df = pd.read_csv("./data/XSHG_5min_600977.csv")
+df['timestamps'] = pd.to_datetime(df['timestamps'])
+
+# Define context window and prediction length
+lookback = 400
+pred_len = 120
+
+# Prepare inputs for the predictor
+x_df = df.loc[:lookback-1, ['open', 'high', 'low', 'close', 'volume', 'amount']]
+x_timestamp = df.loc[:lookback-1, 'timestamps']
+y_timestamp = df.loc[lookback:lookback+pred_len-1, 'timestamps']
+```
+
+#### 4. Generate Forecasts
+
+Call the `predict` method to generate forecasts. You can control the sampling process with parameters like `T`, `top_p`, and `sample_count` for probabilistic forecasting.
+
+```python
+# Generate predictions
+pred_df = predictor.predict(
+    df=x_df,
+    x_timestamp=x_timestamp,
+    y_timestamp=y_timestamp,
+    pred_len=pred_len,
+    T=1.0,          # Temperature for sampling
+    top_p=0.9,      # Nucleus sampling probability
+    sample_count=1  # Number of forecast paths to generate and average
+)
+
+print("Forecasted Data Head:")
+print(pred_df.head())
+```
+
+The `predict` method returns a pandas DataFrame containing the forecasted values for `open`, `high`, `low`, `close`, `volume`, and `amount`, indexed by the `y_timestamp` you provided.
+
+#### 5. Example and Visualization
+
+For a complete, runnable script that includes data loading, prediction, and plotting, please see [`examples/prediction_example.py`](https://github.com/shiyu-coder/Kronos/blob/main/examples/prediction_example.py).
+
+Running this script will generate a plot comparing the ground truth data against the model's forecast, similar to the one shown below:
+
+<p align="center">
+    <img src="https://github.com/shiyu-coder/Kronos/raw/main/figures/prediction_example.png" alt="Forecast Example" align="center" width="600px" />
+</p>
+
+Additionally, we also provide a script that makes predictions without Volume and Amount data, which can be found in [`examples/prediction_wo_vol_example.py`](https://github.com/shiyu-coder/Kronos/blob/main/examples/prediction_wo_vol_example.py).
+
+## Citation
+
+If you use Kronos in your research, we would appreciate a citation to our [paper](https://arxiv.org/abs/2508.02739):
+
+```bibtex
+@misc{shi2025kronos,
+      title={Kronos: A Foundation Model for the Language of Financial Markets}, 
+      author={Yu Shi and Zongliang Fu and Shuo Chen and Bohan Zhao and Wei Xu and Changshui Zhang and Jian Li},
+      year={2025},
+      eprint={2508.02739},
+      archivePrefix={arXiv},
+      primaryClass={q-fin.ST},
+      url={https://arxiv.org/abs/2508.02739}, 
+}
+```
+
+## License 
+This project is licensed under the [MIT License](https://github.com/shiyu-coder/Kronos/blob/main/LICENSE).