Update app.py

app.py

@@ -32,7 +32,7 @@ input: smiles of one compounds, such as CC(OCC)=O; \n
        the ratio of five solvents (example: 20 1 0 0 0 for PE:EA=20:1)\n
 output: the predicted Rf value.\n
 
-## Citation
+## Citation\n
 Welcome to cite our work:\n
 H. Xu, J. Lin, Q. Liu, Y. Chen, J. Zhang, Y. Yang, M.C. Young, Y. Xu, D. Zhang, F. Mo
 High-throughput discovery of chemical structure-polarity relationships combining automation and machine-learning techniques
@@ -289,7 +289,7 @@ if __name__=='__main__':
                 </div>
             ''')
         gr.Markdown(model_card)
-        demo = gr.Interface(fn=predict_single, inputs=["text", "number","number","number","number","number"], outputs='number')
+        gr.Interface(fn=predict_single, inputs=["text", "number","number","number","number","number"], outputs='number')
     demo.launch()
     # smile='O=C(OC1C(OC(C)=O)C(OC(C)=O)C(OC(C)=O)C(COC(C)=O)O1)C'
     # eluent=[0,0.9,0,0,0]