Update README.md

README.md

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 # D2A: A Dataset Built for AI-Based Vulnerability Detection Methods Using Differential Analysis
 This is an unofficial HuggingFace upload of the D2A dataset from "[D2A: A Dataset Built for AI-Based Vulnerability Detection Methods Using Differential Analysis](https://arxiv.org/abs/2102.07995)". "Test" splits have all labels as -1 as they are not provided.
 
+Usage:
+```python
+from datasets import load_dataset
+
+# Use "code", "code_trace", "function", or "trace" to load the different variants.
+dataset = load_dataset("claudios/D2A", "code")
+```
 ***
 
 # D2A Leaderboard Data