Remove examples with long answers and zero reward

Filter with `lambda x: not (len(x['answer']) > 20 and x['avg@16_qwen3_4b_instruct_2507'] == 0)`

README.md

@@ -56,10 +56,10 @@ dataset_info:
     dtype: float64
   splits:
   - name: train
-    num_bytes: 9229182
-    num_examples: 33775
-  download_size: 5539301
-  dataset_size: 9229182
+    num_bytes: 8008279.40411547
+    num_examples: 29307
+  download_size: 4803009
+  dataset_size: 8008279.40411547
 configs:
 - config_name: code
   data_files:

science/train-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:87ae17e462e402ba7ab5ab6436a8cd8f0b5b0eafd008deb3474797de444e7f13
-size 5539301
+oid sha256:2dd5a390ee42c0a7829552e83361d19a952b7e480786254ea38eee657fbc78da
+size 4803009