Update README with explicit Parquet config and improved dataset card

README.md

@@ -22,11 +22,20 @@ task_ids:
 - masked-language-modeling
 paperswithcode_id: null
 pretty_name: Penn Treebank
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: test
+    path: data/test-*
+  - split: validation
+    path: data/validation-*
 dataset_info:
   features:
   - name: sentence
     dtype: string
-  config_name: penn_treebank
+  config_name: default
   splits:
   - name: train
     num_bytes: 5143706
@@ -80,7 +89,7 @@ dataset_info:
 
 ### Dataset Summary
 
-This is the Penn Treebank Project: Release 2 CDROM, featuring a million words of 1989 Wall Street Journal material. 
+This is the Penn Treebank Project: Release 2 CDROM, featuring a million words of 1989 Wall Street Journal material.
 The rare words in this version are already replaced with <unk> token. The numbers are replaced with <N> token.
 
 ### Supported Tasks and Leaderboards
@@ -95,15 +104,23 @@ The text in the dataset is in American English
 
 ### Data Instances
 
-[Needs More Information]
+An example instance:
+
+```json
+{"sentence": "pierre <unk> N years old will join the board as a nonexecutive director nov. N"}
+```
 
 ### Data Fields
 
-[Needs More Information]
+- `sentence` (string): A sentence from the Wall Street Journal corpus with rare words replaced by `<unk>` and numbers by `<N>`.
 
 ### Data Splits
 
-[Needs More Information]
+| Split      | Examples |
+|------------|----------|
+| train      | 42,068   |
+| test       | 3,761    |
+| validation | 3,370    |
 
 ## Dataset Creation
 
@@ -161,6 +178,7 @@ Dataset provided for research purposes only. Please check dataset license for ad
 
 ### Citation Information
 
+```bibtex
 @article{marcus-etal-1993-building,
     title = "Building a Large Annotated Corpus of {E}nglish: The {P}enn {T}reebank",
     author = "Marcus, Mitchell P.  and
@@ -173,6 +191,8 @@ Dataset provided for research purposes only. Please check dataset license for ad
     url = "https://www.aclweb.org/anthology/J93-2004",
     pages = "313--330",
 }
+```
+
 ### Contributions
 
-Thanks to [@harshalmittal4](https://github.com/harshalmittal4) for adding this dataset.
+Thanks to [@harshalmittal4](https://github.com/harshalmittal4) for adding this dataset.