Update app.py

right now the output is coming in square brackets so

app.py

@@ -39,7 +39,7 @@ def generate(prompt, seq_len=128, temperature=0.8, filter_thres=0.9):
         use_tqdm=True,
     )
 
-    decoded_output = tokenizer.batch_decode(output_tensor, skip_special_tokens=True)
+    decoded_output = tokenizer.batch_decode(output_tensor[0], skip_special_tokens=True)
 
     return decoded_output