add humaneval example

evaluation/intro.txt

@@ -1,7 +1,7 @@
 A popular evaluation framework for code generation models is the [pass@k](https://huggingface.co/metrics/code_eval) metric on [HumanEval](https://huggingface.co/datasets/openai_humaneval) dataset, which was introduced in [Codex paper](https://arxiv.org/pdf/2107.03374v2.pdf). The dataset includes 164 handwritten programming problems. In the pass@k metric, k code samples are generated per problem, a problem is considered solved if any sample passes the unit tests and the total fraction of problems solved is reported. Below are some examples for the selcted models.
 For most models, we sample 200 candidate program completions, and compute pass@1, pass@10, and pass@100 using an unbiased sampling estimator. The table below shows the humanEval scores of CodeParrot, InCoder, GPT-neo models, GPT-J and Codex (not open-source).
 
-<div align="center">
+<center>
 
 | Model | pass@1 | pass@10 | pass@100|
 |-------|--------|---------|---------|
@@ -16,12 +16,12 @@ For most models, we sample 200 candidate program completions, and compute pass@1
 |GPT-neo (1.5B)| 4.79% | 7.47% | 16.30% |
 |GPT-J (6B)| 11.62% | 15.74% | 27.74% |
 
-</div>
+<center>
 
 
 To better understand how pass@k metric works, we will illustrate it with some examples. We select 4 tasks from the HumanEval dataset and see how the models performs and which code completions pass the unit tests. We will use CodeParrot 🦜 . We select the three folowwing problem from HumanEval
 
-```
+```python
 
 from typing import List