Update README.md

README.md

@@ -26,7 +26,11 @@ Code to support Mathfish can be found in this [Github repository](https://github
 
 <!-- Provide a longer summary of what this dataset is. -->
 
-Common Core State Standards (CCSS) offer fine-grained and comprehensive coverage of K-12 math skills/concepts. We scrape labeled problems from two reputable OER that span a wide range of grade levels and standards: [Illustrative Mathematics](https://illustrativemathematics.org/) and [Fishtank Learning](https://fishtanklearning.org/). Each problem is a segment of these materials demarcated by standards labels, and a problem may be labeled with multiple standards. 
+Common Core State Standards (CCSS) offer fine-grained and comprehensive coverage of K-12 math skills/concepts. We scrape labeled problems from two reputable OER that span a wide range of grade levels and standards: [Illustrative Mathematics](https://illustrativemathematics.org/) and [Fishtank Learning](https://fishtanklearning.org/). Each problem is a segment of these materials demarcated by standards labels, and a problem may be labeled with multiple standards.
+
+Number of problems: 4356 in `dev.jsonl`, 4355 in `test.jsonl`, 13065 in `train.jsonl`. In total, 21776 K-12 math problems. 
+
+Number of images: 1848 in `fl_problem`, 11736 in `im_lesson`, 27 in `im_modelingprompt`, 3497 in `im_practice`, 860 in `im_task`. In total, 17968 math images. 
 
 - **Curated by:** Lucy Li, Tal August, Rose E Wang, Luca Soldaini, Courtney Allison, Kyle Lo 
 - **Funded by:** The Gates Foundation
@@ -69,7 +73,7 @@ Each `*.jsonl` file contains one problem or activity per line:
 }
 ```
 
-Note: Among standard relation types, `Addressing` == `Alignment`, and we evaluate on these in our paper. Future work may investigate other types of relations between problems and math skills/concepts.
+Note: Among standard relation types, `Addressing` == `Alignment`, and we evaluate on these in our paper. Future work may investigate other types of relations between problems and math skills/concepts. Not all problems in each file contain standards.
 
 Images are in the `images` folder, in zipped files named after image filenames' prefixes: `fl_problem`, `im_lesson`, `im_modelingprompt`, `im_practice`, `im_task`.