Change to calculate speedup when data size is 2

Signed-off-by: syeo <ray.yeo@intel.com>

Author: syeo

AI-and-Analytics/Features-and-Functionality/IntelTensorFlow_Enabling_Auto_Mixed_Precision_for_TransferLearning/scripts/plot.py

@@ -8,10 +8,10 @@
         throughput = line.split(': ')[1]
         throughput_list.append(float(throughput))
 
-if len(throughput_list) >= 2:
+if len(throughput_list) == 2:
     speedup = float(throughput_list[1])/float(throughput_list[0])
     print("Speedup : ", speedup)
     df = pd.DataFrame({'pretrained_model':['saved model', 'optimized model'], 'Speedup':[1, speedup]})
     ax = df.plot.bar( x='pretrained_model', y='Speedup', rot=0)
 else:
-    print("Insufficient data to calculate speedup")
+    print("Incorrect data size to calculate speedup")