rm .idea and fix min_max scaler bugs

Author: Lapis-Hong

.gitignore

@@ -9,4 +9,6 @@ dist
 build
 
 #
-model
+model/
+.idea/
+log/

python/lib/build_estimator.py

@@ -61,7 +61,7 @@ def embedding_dim(dim):
     def normalizer_fn_builder(scaler, normalization_params):
         """normalizer_fn builder"""
         if scaler == 'min_max':
-            return lambda x: (x-normalization_params[0]) / (x-normalization_params[1])
+            return lambda x: (x-normalization_params[0]) / (normalization_params[1]-normalization_params[0])
         elif scaler == 'standard':
             return lambda x: (x-normalization_params[0]) / normalization_params[1]
         else: