Fix integration tests

Author: Balaji Veeramani

tests/integ/test_byo_estimator.py

@@ -40,7 +40,7 @@ class _FactorizationMachineSerializer(BaseSerializer):
 
     CONTENT_TYPE = "application/json"
 
-    def serialize(data):
+    def serialize(self, data):
         js = {"instances": []}
         for row in data:
             js["instances"].append({"features": row.tolist()})

tests/integ/test_tuner.py

@@ -916,7 +916,7 @@ class _FactorizationMachineSerializer(BaseSerializer):
 
     CONTENT_TYPE = "application/json"
 
-    def serializer(data):
+    def serialize(self, data):
         js = {"instances": []}
         for row in data:
             js["instances"].append({"features": row.tolist()})

tests/integ/test_tuner_multi_algo.py

@@ -223,7 +223,7 @@ class PredictionDataSerializer(BaseSerializer):
 
     CONTENT_TYPE = "application/json"
 
-    def serialize(data):
+    def serialize(self, data):
         js = {"instances": []}
         for row in data:
             js["instances"].append({"features": row.tolist()})