Add mega dataset manifest

manifest.json

@@ -0,0 +1,79 @@
+{
+  "dataset": "Polish technical mega DynaWord",
+  "version": "0.1.0",
+  "language": [
+    "pl"
+  ],
+  "schema": [
+    "id",
+    "text",
+    "source",
+    "added",
+    "created",
+    "token_count",
+    "license",
+    "author"
+  ],
+  "layout": {
+    "train": "data/train.parquet",
+    "valid": "data/validation.parquet",
+    "test": "data/test.parquet",
+    "samples": "samples/{train,valid,test}.jsonl"
+  },
+  "scope": "Polish technical mega-corpus: CNC, machine tools, industrial maintenance, automation, PLC, robotics, mechatronics, engineering, chemistry and open technical textbooks.",
+  "source_policy": "Only audited local layers with per-record CC BY, CC BY-SA, CC0, public-domain, GFDL or GPL metadata; evaluation splits and forbidden licences excluded.",
+  "deduplication": "Exact normalized-text deduplication across every selected input layer and within this dataset.",
+  "documents": 17575,
+  "tokens": 31879213,
+  "sources": {
+    "bcpw-public-domain": {
+      "documents": 1398
+    },
+    "bibliotekanauki-automation": {
+      "documents": 2262
+    },
+    "bibliotekanauki-maintenance": {
+      "documents": 3121
+    },
+    "open_agh_chemistry_pl": {
+      "documents": 370
+    },
+    "open_icm_pl": {
+      "documents": 11
+    },
+    "rock-pollub-open": {
+      "documents": 569
+    },
+    "rock_pollub_pl": {
+      "documents": 8
+    },
+    "wikibooks": {
+      "documents": 9040
+    },
+    "wikisource-maszynisci-1873": {
+      "documents": 148
+    },
+    "zpe-cnc-pl": {
+      "documents": 648
+    }
+  },
+  "splits": {
+    "train": {
+      "documents": 15796,
+      "tokens": 28547739
+    },
+    "valid": {
+      "documents": 899,
+      "tokens": 1722656
+    },
+    "test": {
+      "documents": 880,
+      "tokens": 1608818
+    }
+  },
+  "input_files": 18,
+  "input_rows": 19273,
+  "duplicate_rows": 1698,
+  "forbidden_license_rows": 0,
+  "control_chars_removed": 5
+}