Components - XGBoost - Added Train_and_cross-validate_regression comp…

…onent (#4245)

* Components - XGBoost - Added Train_and_cross-validate_regression component

* Added sample pipeline

components/XGBoost/Train_and_cross-validate_regression/from_CSV/component.py

@@ -0,0 +1,49 @@
+from collections import OrderedDict
+from kfp import components
+
+
+xgboost_train_regression_and_calculate_metrics_on_csv_op = components.load_component_from_url('https://raw.githubusercontent.com/kubeflow/pipelines/18e8974288885086b2fd5351f6333210cd237d1b/components/XGBoost/Train_regression_and_calculate_metrics/from_CSV/component.yaml')
+xgboost_5_fold_cross_validation_for_regression_op = components.load_component_from_url('https://raw.githubusercontent.com/kubeflow/pipelines/271593e4193e2d3e44bdf42269fc03f0fcd2e5e8/components/XGBoost/Cross_validation_for_regression/from_CSV/component.yaml')
+
+
+def xgboost_train_and_cv_regression_on_csv(
+    data: 'CSV',
+    label_column: int = 0,
+    objective: str = 'reg:squarederror',
+    num_iterations: int = 200,
+):
+    main_training_and_metrics_task = xgboost_train_regression_and_calculate_metrics_on_csv_op(
+        training_data=data,
+        testing_data=data,
+        label_column=label_column,
+        objective=objective,
+        num_iterations=num_iterations,
+    )
+
+    cv_training_and_metrics_task = xgboost_5_fold_cross_validation_for_regression_op(
+        data=data,
+        label_column=label_column,
+        objective=objective,
+        num_iterations=num_iterations,
+    )
+
+    return OrderedDict([
+        ('model', main_training_and_metrics_task.outputs['model']),
+
+        ('training_mean_absolute_error', main_training_and_metrics_task.outputs['mean_absolute_error']),
+        ('training_mean_squared_error', main_training_and_metrics_task.outputs['mean_squared_error']),
+        ('training_root_mean_squared_error', main_training_and_metrics_task.outputs['root_mean_squared_error']),
+        ('training_metrics', main_training_and_metrics_task.outputs['metrics']),
+
+        ('cv_mean_absolute_error', cv_training_and_metrics_task.outputs['mean_absolute_error']),
+        ('cv_mean_squared_error', cv_training_and_metrics_task.outputs['mean_squared_error']),
+        ('cv_root_mean_squared_error', cv_training_and_metrics_task.outputs['root_mean_squared_error']),
+        ('cv_metrics', cv_training_and_metrics_task.outputs['metrics']),
+    ])
+
+
+if __name__ == '__main__':
+    xgboost_train_and_cv_regression_on_csv_op = components.create_graph_component_from_pipeline_func(
+        xgboost_train_and_cv_regression_on_csv,
+        output_component_file='component.yaml',
+    )