Fix/added unique ids to model_name (#760)

* added unique ids to model_name

* removed pid from the folder name

Co-authored-by: Greg DeVos <gregory.devos@ngc.com>
Co-authored-by: Julien Herzen <julien.herzen@unit8.co>

darts/models/forecasting/forecasting_model.py

@@ -18,6 +18,7 @@
 from random import sample
 import numpy as np
 import pandas as pd
+import time
 
 from darts.timeseries import TimeSeries
 from darts.logging import get_logger, raise_log, raise_if_not, raise_if
@@ -686,6 +687,12 @@ def _evaluate_combination(param_combination):
             param_combination_dict = dict(
                 list(zip(parameters.keys(), param_combination))
             )
+            if param_combination_dict.get("model_name", None):
+                current_time = time.strftime("%Y-%m-%d_%H.%M.%S.%f", time.localtime())
+                param_combination_dict[
+                    "model_name"
+                ] = f"{current_time}_{param_combination_dict['model_name']}"
+
             model = model_class(**param_combination_dict)
             if use_fitted_values:  # fitted value mode
                 model._fit_wrapper(series, past_covariates, future_covariates)