aider: Load a fastai learner from `export.pkl` in `app.py`.

# Aider chat conversation:

USER: Modify `app.py` to load a fastai learner from export.pkl

ASSISTANT: To load a fastai learner from `export.pkl`, we need to import the `load_learner` function from the `fastai.learner` module. Then we can call this function with the path to `export.pkl`.

Here are the changes:

```python
app.py
<<<<<<< HEAD
import gradio as gr

def greet():
return "Hello, World!"

iface = gr.Interface(fn=greet, inputs=[], outputs="text")
iface.launch()
=======
import gradio as gr
from fastai.learner import load_learner

learner = load_learner('export.pkl')

def greet():
return "Hello, World!"

iface = gr.Interface(fn=greet, inputs=[], outputs="text")
iface.launch()
>>>>>>> updated
```

This code will load the learner when the script is run. The learner is then available for use in the `greet` function or any other function in the script.

app.py

@@ -1,4 +1,7 @@
 import gradio as gr
+from fastai.learner import load_learner
+
+learner = load_learner('export.pkl')
 
 def greet():
     return "Hello, World!"