fix: UT bug exposed by upgraded dpdata (#1636)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated data representation to enhance classification and processing
of information.
  
- **Bug Fixes**
- Improved data structure to ensure better interpretation and
utilization in subsequent operations.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Han Wang <[email protected]>

tests/generator/out_data_post_fp_gaussian/orig/type_map.raw

@@ -1 +1 @@
-C H
+C H N