Add initial gradio setup

app.py

@@ -3,7 +3,7 @@ from transformers import AutoTokenizer
 from palm_rlhf_pytorch import PaLM
 import gradio as gr
 
-def generate(prompt, seq_len, temperature, filter_thres, model):
+def generate(prompt, seq_len=128, temperature=0.8, filter_thres=0.9):
     device = torch.device("cpu")
 
     model = PaLM(