diff --git a/pyemits/core/ml/regression/trainer.py b/pyemits/core/ml/regression/trainer.py
index 74f61f1..3a52fcf 100644
--- a/pyemits/core/ml/regression/trainer.py
+++ b/pyemits/core/ml/regression/trainer.py
@@ -1,10 +1,12 @@
+import torch
 from sklearn.ensemble import RandomForestRegressor, GradientBoostingRegressor, AdaBoostRegressor
 from sklearn.neural_network import MLPRegressor
 from sklearn.linear_model import ElasticNet, Ridge, Lasso, BayesianRidge, HuberRegressor
 from xgboost import XGBRegressor
 from lightgbm import LGBMRegressor
 from pyemits.core.ml.base import BaseTrainer, BaseWrapper, NeuralNetworkWrapperBase
-from pyemits.common.config_model import BaseConfig, KerasSequentialConfig
+from pyemits.core.ml.regression.nn import TorchLightningWrapper
+from pyemits.common.config_model import BaseConfig, KerasSequentialConfig, TorchLightningSequentialConfig
 from pyemits.common.data_model import RegressionDataModel
 from pyemits.common.py_native_dtype import SliceableDeque
 from pyemits.common.validation import raise_if_value_not_contains
@@ -42,6 +44,14 @@ def __init__(self,
                  raw_data_model: RegressionDataModel,
                  other_config: Dict[str, Union[List, BaseConfig, Any]] = {}):
         """
+        universal class for regression model training,
+        all-in-one training including sklearn, xgboost, lightgbm, keras, pytorch_lightning
+
+        you are not required to fill the algo config if you have idea on algo_config
+        the algo config is designed for people to config their model based on the configuration that provided in config_model
+        so that people can easily config their model during creation
+
+        for Pytorch_lightning user, pls configured your model before use this. at that moment, no algo_config is
 
         Parameters
         ----------
@@ -111,6 +121,11 @@ def fill_algo_config_clf(self,
                         clf_or_wrapper.model_obj.add(i)
                     clf_or_wrapper.model_obj.compile(**algo_config.compile)
                     return clf_or_wrapper
+                elif isinstance(algo_config, TorchLightningSequentialConfig):
+                    clf_or_wrapper: TorchLightningWrapper
+                    for nos, layer in enumerate(algo_config.layer, 1):
+                        clf_or_wrapper.add_layer2blank_model(str(nos), layer)
+                    return clf_or_wrapper
                 # not support pytorch, mxnet model right now
                 raise TypeError('now only support KerasSequentialConfig')
 
@@ -129,15 +144,28 @@ def fill_fit_config_clf(self,
                             y,
                             fit_config: Optional[Union[BaseConfig, Dict]] = None,
                             ):
+        from pyemits.core.ml.regression.nn import torchlighting_data_helper
         # nn wrapper
         if isinstance(clf_or_wrapper, NeuralNetworkWrapperBase):
+            dl_train, dl_val = torchlighting_data_helper(X, y)
+
             if fit_config is None:
+                # pytorch_lightning path
+                if isinstance(clf_or_wrapper, TorchLightningWrapper):
+                    return clf_or_wrapper.fit(dl_train, dl_val)
+                # keras path
                 return clf_or_wrapper.fit(X, y)
 
             if isinstance(fit_config, BaseConfig):
+                if isinstance(clf_or_wrapper, TorchLightningWrapper):
+                    return clf_or_wrapper.fit(dl_train, dl_val, **dict(fit_config))
+                # keras path
                 return clf_or_wrapper.fit(X, y, **dict(fit_config))
 
             elif isinstance(fit_config, Dict):
+                if isinstance(clf_or_wrapper, TorchLightningWrapper):
+                    return clf_or_wrapper.fit(dl_train, dl_val, **fit_config)
+                # keras path
                 return clf_or_wrapper.fit(X, y, **fit_config)
 
         # sklearn/xgboost/lightgbm clf
@@ -204,7 +232,6 @@ def _get_fitted_trainer(algo: List,
             algo_, algo_config_ in
             zip(self._algo, self._algo_config))
 
-        # self.clf_models = [obj.clf_models for obj in out]
         for obj in out:
             self.clf_models.append(obj.clf_models)
         return
@@ -214,6 +241,12 @@ def fit(self):
 
 
 class MultiOutputRegTrainer(RegTrainer):
+    """
+    machine learning based multioutput regression trainer
+    bring forecasting power into machine learning model,
+    forecasting is not only the power of deep learning
+    """
+
     def __init__(self,
                  algo: List[Union[str, Any]],
                  algo_config: List[Optional[BaseConfig]],