Record visual conversion provenance and exclusions

provenance.json

@@ -0,0 +1,15 @@
+{
+  "source_url": "https://fedora.clarin-d.uni-saarland.de/sfb1102/MCScript-2.0.zip",
+  "archive_sha256": "50037b08123a4660e2e00ad07bcfa2a7ddc1d666b05b198d359cd2cda8f5e88c",
+  "excluded": {
+    "train/invalid_choices": 1
+  },
+  "splits": {
+    "train": 14190,
+    "validation": 2020,
+    "test": 3610
+  },
+  "split_policy": "native story partitions",
+  "conversion_sha256": "4857f543c86f9b0ba40b49b7a59a0911088428091ae061c73a799669e8ed7b82",
+  "license": "unspecified"
+}