Update readme of deepfm

deep_fm/README.md

@@ -73,6 +73,11 @@ python train.py \
         2>&1 | train.log
 ```
 
+## Evaluation
+
+After training pass 9 batch 40000, the testing AUC is `0.807178` and the testing
+cost is `0.445196`.
+
 ## Infer
 The command line options for infering can be listed by `python infer.py -h`.