| # ChainFlow-VLA VLM Feature Cache |
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| This dataset provides cached VLM hidden features and trajectory targets used by ChainFlow-VLA on NAVSIM. |
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| ## Dataset Structure |
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| navtest/ |
| navtest.tar.zst |
| checksums_navtest.sha256 |
| |
| trainval/ |
| trainval_0000.tar.zst |
| trainval_0001.tar.zst |
| ... |
| trainval_0023.tar.zst |
| checksums_trainval.sha256 |
| trainval_logs.txt |
| |
| The `trainval` split is sharded by NAVSIM log folders. Each shard is an independent `.tar.zst` archive. |
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| After extraction, each token folder contains: |
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| internvl_feature.gz |
| trajectory_target.gz |
| |
| ## Extract |
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| Extract navtest: |
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| tar --zstd -xf navtest/navtest.tar.zst |
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| Extract all trainval shards: |
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| for f in trainval/trainval_*.tar.zst; do |
| tar --zstd -xf "$f" |
| done |
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| ## Verify Checksums |
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| Verify navtest: |
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| cd navtest |
| sha256sum -c checksums_navtest.sha256 |
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| Verify trainval: |
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| cd trainval |
| sha256sum -c checksums_trainval.sha256 |
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| ## Notes |
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| - `trainval` contains 24 independent shards. |
| - `navtest` is packed into a single archive. |
| - The archives use `zstd` compression. Please install `zstd` before extraction if your system does not support `tar --zstd`. |
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