Add metadata.json

metadata.json

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+{
+  "READY": true,
+  "name": "avida_htnfa_onehot",
+  "task": "binary",
+  "num_classes": 2,
+  "cat_idx": [
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+  ],
+  "num_samples": 5580,
+  "num_features": 150,
+  "imbalance_ratio": 7.1818,
+  "description": "Binary classification: predict VHH nanobody binding to hTNFa. Single antigen \u2014 antigen features omitted. Features: padded integer AA token IDs of VHH sequence (vocab size 21, 0=PAD). Split: CD-HIT cluster-based 80/10/10 on VHH sequences (c=0.7, aS=0.8).",
+  "source": "COGNANO AVIDa datasets (HuggingFace: cognano/AVIDa-hIL6, cognano/AVIDa-hTNFa, cognano/AVIDa-SARS-CoV-2). VHH (nanobody) sequences with binary binding labels against antigen variants.",
+  "label": "Proteomics",
+  "sub_labels": [
+    "Antigenomics"
+  ]
+}