add exception for not passing timerange. Remove hard coded arguments for CatboostPredictionModels. Update docs

freqtrade/freqai/data_kitchen.py

@@ -76,6 +76,9 @@ class FreqaiDataKitchen:
         self.keras = self.freqai_config.get("keras", False)
         self.set_all_pairs()
         if not self.live:
+            if not self.config["timerange"]:
+                raise OperationalException(
+                    'Please pass --timerange if you intend to use FreqAI for backtesting.')
             self.full_timerange = self.create_fulltimerange(
                 self.config["timerange"], self.freqai_config.get("train_period_days")
             )

freqtrade/freqai/prediction_models/CatboostPredictionModel.py

@@ -38,8 +38,6 @@ class CatboostPredictionModel(BaseRegressionModel):
 
         model = CatBoostRegressor(
             allow_writing_files=False,
-            verbose=100,
-            early_stopping_rounds=400,
             **self.model_training_parameters,
         )
         model.fit(X=train_data, eval_set=test_data)

freqtrade/freqai/prediction_models/CatboostPredictionMultiModel.py

@@ -27,9 +27,6 @@ class CatboostPredictionMultiModel(BaseRegressionModel):
 
         cbr = CatBoostRegressor(
             allow_writing_files=False,
-            gpu_ram_part=0.5,
-            verbose=100,
-            early_stopping_rounds=400,
             **self.model_training_parameters,
         )