Upload README.md

README.md

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 <h2 id="how-to-download" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📥 How to Download</h2>
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 PhysInOne is distributed across multiple Hugging Face dataset repositories because of its large scale. We provide two scripts for selecting and downloading cases:
 
 - `filter_cases.py`: parses the case-to-repository assignment file and exports selected cases to JSON.
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 - Activity complexity: `single`, `double`, `triple`
 - Physical phenomenon abbreviation: `MovingHitsFixed`, `FrictionStop`, `LiquidTension`, ..., `GranularFall`
 - Number of cases: globally sample `num` cases after filtering
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 <h3 id="download-scripts" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 24px;">1. Download Scripts</h3>
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 Please download the `assets` folder, which contains:
 
 ```text
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   filter_cases.py
   download.py
 ```
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 <h3 id="install-dependencies" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 24px;">2. Install Dependencies</h3>
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 ```bash
 pip install huggingface_hub tqdm
 ```
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 <h3 id="filter-cases" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 24px;">3. Filter Cases</h3>
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 <h4 id="filter-by-split" style="font-size: 1.12em; margin-top: 0.55em; margin-bottom: 0.14em; line-height: 1.18; margin-left: 48px;">3.1 Filter by split</h4>
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 ```bash
 python scripts/filter_cases.py \
   --split train \
   --output selected_cases.json
 ```
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 <h4 id="filter-by-split-and-activity" style="font-size: 1.12em; margin-top: 0.55em; margin-bottom: 0.14em; line-height: 1.18; margin-left: 48px;">3.2 Filter by split and activity complexity</h4>
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 ```bash
 python scripts/filter_cases.py \
   --split train \
   --activity_type double \
   --output selected_cases.json
 ```
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 <h4 id="filter-by-phenomenon" style="font-size: 1.12em; margin-top: 0.55em; margin-bottom: 0.14em; line-height: 1.18; margin-left: 48px;">3.3 Filter by physical phenomenon abbreviation</h4>
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 By default, phenomenon matching uses `contains` mode. For example, the following command selects all double-physics cases that contain `FrictionStop`:
 
 ```bash
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   --match_mode exact \
   --output selected_cases.json
 ```
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 <h4 id="random-sampling" style="font-size: 1.12em; margin-top: 0.55em; margin-bottom: 0.14em; line-height: 1.18; margin-left: 48px;">3.4 Randomly sample a fixed number of cases</h4>
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 `--num` is the global number of cases sampled after filtering. The default random seed is `42`.
 
 ```bash
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   --seed 42 \
   --output selected_cases.json
 ```
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 <h3 id="download-selected-cases" style="font-size: 1.35em; margin-top: 0.75em; margin-bottom: 0.22em; line-height: 1.2; margin-left: 24px;">4. Download Selected Cases</h3>
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 Each selected case is downloaded as a zip file from the corresponding Hugging Face shard repository.
 
 ```bash
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       DoublePhysics/
         AccelConcaveSpin_AccelSurfaceSpin__bg070__K5ER39_trajectory.zip
 ```
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 <h2 id="license" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📜 License</h2>
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 > ⚠️ Note: PhysInOne is intended for **non-commercial research and educational purposes**. For commercial use, users must verify the licensing terms of individual assets.
 
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 <h2 id="citation" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📚 Citation</h2>
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 <h2 id="contact" style="margin-left: 0; font-size: 1.9em; line-height: 1.22; margin-top: 1.2em; margin-bottom: 0.5em;">📮 Contact</h2>
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