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README.md

@@ -1,61 +1,87 @@
 ---
-dataset_info:
-  features:
-  - name: row_id
-    dtype: large_string
-  - name: sid
-    dtype: large_string
-  - name: submission_id
-    dtype: large_string
-  - name: pid
-    dtype: large_string
-  - name: problem_id
-    dtype: large_string
-  - name: uid
-    dtype: large_string
-  - name: user_id
-    dtype: large_string
-  - name: date
-    dtype: int64
-  - name: date_iso
-    dtype: timestamp[ms]
-  - name: source_name
-    dtype: large_string
-  - name: code
-    dtype: large_string
-  - name: compilemessage
-    dtype: large_string
-  - name: compile_status
-    dtype: large_string
-  - name: exit_code
-    dtype: int64
-  - name: javac_version
-    dtype: large_string
-  - name: category
-    dtype: large_string
-  - name: label_status
-    dtype: large_string
-  - name: taxonomy_version
-    dtype: large_string
-  - name: session_id
-    dtype: large_string
-  - name: session_6h
-    dtype: large_string
-  - name: source
-    dtype: large_string
-  - name: original_status
-    dtype: large_string
-  - name: code_size
-    dtype: int64
-  splits:
-  - name: train
-    num_bytes: 58213380
-    num_examples: 34555
-  download_size: 13659068
-  dataset_size: 58213380
-configs:
-- config_name: default
-  data_files:
-  - split: train
-    path: data/train-*
+license: apache-2.0
+task_categories:
+- text-classification
+language:
+- en
+tags:
+- java
+- compile-errors
+- codenet
+- education
+pretty_name: CodeNet Java compile errors v2
+size_categories:
+- 10K<n<100K
 ---
+
+# CodeNet Java compile errors v2
+
+This is a **new, Java-only corpus** rebuilt from
+[`iNeil77/CodeNet`](https://huggingface.co/datasets/iNeil77/CodeNet) (the Java
+split, `status == "Compile Error"`). It is deliberately separate from
+[`criyle/codenet-compile-errors`](https://huggingface.co/datasets/criyle/codenet-compile-errors),
+which used the old `Main.java` convention and did not carry user/problem/date
+metadata.
+
+## What is different
+
+Each submission is written to the file name javac asks for — the single public
+top-level class it declares, or `Main.java` when there is no such class or more
+than one. Submissions that compile cleanly under that name are **file-name
+artefacts**, not student errors; they are kept in `compiled_all.parquet` but
+excluded from this dataset.
+
+The source-name fix is why this corpus is smaller than the raw Compile Error
+set: `18,465` of
+`53,023` submissions compiled cleanly once the file was named
+after the class. `34,555` still fail and are
+the rows of this dataset.
+
+## Metadata for session grouping
+
+Unlike the old dataset, each row keeps:
+
+| Column | Meaning |
+|---|---|
+| `row_id` | stable `v2_<sid>` id |
+| `sid`, `submission_id` | CodeNet submission id |
+| `pid`, `problem_id` | CodeNet problem id |
+| `uid`, `user_id` | CodeNet user id |
+| `date`, `date_iso` | CodeNet submission time |
+| `source_name` | file name used for the compile (`Foo.java` / `Main.java`) |
+| `code`, `compilemessage` | source and javac stderr |
+| `session_id` | `(uid, pid)` 2-hour session |
+| `session_6h` | 6-hour variant |
+
+`session_id` is a contiguous run of submissions by one user on one problem,
+with a new session when the gap exceeds 2 hours. It is computed on the **full**
+Java split (accepted submissions included), so a user's accepted submission
+still closes the session boundary.
+
+## Labels
+
+`category` is intentionally empty and `label_status` is `unlabelled`. The v2.1
+taxonomy (`categories.v2.yaml`) is included, but labelling is a separate LLM
+pass with its own calibration gates. **No v1 labels are mixed into the `category`
+column.**
+
+## Provenance
+
+- source: `iNeil77/CodeNet`, Java split
+- filter: `status == 'Compile Error'`
+- sandbox: `http://10.0.0.162:5050`
+- javac: `OpenJDK 21.0.12.1`
+- session gap: `2 h` (`6 h` alternative)
+- built at: `2026-10-20T02:28:07.997126+00:00`
+
+## Files
+
+- `train` — the still-failing submissions (`corpus_v2.parquet`)
+- `compiled_all.parquet` — every compile attempt, including file-name artefacts
+- `session_map_all.parquet` — session map over the full Java split
+- `categories.v2.yaml` — active v2.1 taxonomy
+- `source_manifest.json` — counts, hashes and build parameters
+
+## Licence
+
+CodeNet is Apache-2.0. This derived corpus is released under the same terms.