change transform

tensnsorflow/ffm.py

@@ -113,6 +113,7 @@ def get_statistics():
     for i in df.columns.difference(["device_id", "os","total"]):
         df[i] = df[i]/df["total"]
         df[i] = df[i].apply(lambda x: format(x,".4f"))
+        df[i] = df[i].astype("float")
     df = df.drop("total", axis=1)
 
     df["y"] = 1