Add CREATE_REPRODUCTION_REPORT instructions to readme | test(torchlib) (#1001)

Author: justinchuby

onnxscript/tests/function_libs/torch_lib/README.md

@@ -1,4 +1,4 @@
-# Test op correctness by comparing with PyTorch results.
+# Test op correctness by comparing with PyTorch results
 
 ## Usage
 
@@ -13,6 +13,16 @@ pytest onnxscript/tests/function_libs/torch_lib/ops_test.py -k ceil
 pytest onnxscript/tests/function_libs/torch_lib/ops_test.py -k nn_functional_scaled_dot_product_attention
 ```
 
+### Environment variables
+
+1. Set environment variable `CATCH_ORT_SEGFAULT=1` to catch segmentation faults
+in onnxruntime by running the inference sessions in a separate process.
+2. Set `CREATE_REPRODUCTION_REPORT=1` to create markdown files for reproduction of errors. E.g.
+
+    ```bash
+    CREATE_REPRODUCTION_REPORT=1 python -m pytest onnxscript/tests/function_libs/torch_lib/ops_test.py -k div_mode_int
+    ```
+
 ## How to add a new operator test
 
 See _usage_ in [ops_test_data.py](./ops_test_data.py)