fix resample

fedot/api/api_utils/api_params_repository.py

@@ -5,7 +5,8 @@
 from golem.core.optimisers.genetic.operators.inheritance import GeneticSchemeTypesEnum
 from golem.core.optimisers.genetic.operators.mutation import MutationTypesEnum
 
-from fedot.core.composer.gp_composer.specific_operators import parameter_change_mutation, boosting_mutation
+from fedot.core.composer.gp_composer.specific_operators import parameter_change_mutation, boosting_mutation, \
+    add_resample_mutation
 from fedot.core.constants import AUTO_PRESET_NAME
 from fedot.core.repository.tasks import TaskTypesEnum
 from fedot.core.utils import default_fedot_data_dir
@@ -135,5 +136,7 @@ def _get_default_mutations(task_type: TaskTypesEnum, params) -> Sequence[Mutatio
         # TODO remove workaround after boosting mutation fix
         if task_type == TaskTypesEnum.ts_forecasting:
             mutations.append(partial(boosting_mutation, params=params))
+        else:
+            mutations.append(add_resample_mutation)
 
         return mutations

fedot/core/composer/gp_composer/specific_operators.py

@@ -90,6 +90,17 @@ def boosting_mutation(pipeline: Pipeline, requirements, graph_gen_params, **kwar
     return pipeline
 
 
+def add_resample_mutation(pipeline: Pipeline, **kwargs):
+    resample_node = PipelineNode('resample')
+
+    p_nodes = [p_node for p_node in pipeline.primary_nodes]
+    pipeline.add_node(resample_node)
+
+    for node in p_nodes:
+        pipeline.connect_nodes(resample_node, node)
+    return pipeline
+
+
 def choose_new_model(boosting_model_candidates: List[str]) -> str:
     """ Since 'linear' and 'dtreg' operations are suitable for solving the problem
     and they are simpler than others, they are preferred """

fedot/core/pipelines/pipeline.py

@@ -1,7 +1,7 @@
 from copy import deepcopy
 from datetime import timedelta
 from os import PathLike
-from typing import Optional, Tuple, Union, Sequence
+from typing import Optional, Tuple, Union, Sequence, List
 
 import func_timeout
 from golem.core.dag.graph import Graph
@@ -327,6 +327,19 @@ def root_node(self) -> Optional[PipelineNode]:
             raise ValueError(f'{ERROR_PREFIX} More than 1 root_nodes in pipeline')
         return root[0]
 
+    @property
+    def primary_nodes(self) -> List[PipelineNode]:
+        """Finds pipelines sink-node
+
+        Returns:
+            the final predictor-node
+        """
+        if not self.nodes:
+            return []
+        primary_nodes = [node for node in self.nodes
+                         if not node.nodes_from]
+        return primary_nodes
+
     def pipeline_for_side_task(self, task_type: TaskTypesEnum) -> 'Pipeline':
         """Returns pipeline formed from the last node solving the given problem and all its parents
 

fedot/core/pipelines/verification_rules.py

@@ -166,12 +166,14 @@ def has_correct_location_of_resample(pipeline: Pipeline):
                 is_resample_primary = True
             else:
                 is_not_resample_primary = True
-        if node.name == 'resample':
-            raise ValueError(
-                f'{ERROR_PREFIX} Pipeline can have only one resample operation located in start of the pipeline')
+        else:
+            if node.name == 'resample':
+                raise ValueError(
+                    f'{ERROR_PREFIX} Pipeline can have only one resample operation located in start of the pipeline')
     if is_resample_primary and is_not_resample_primary:
         raise ValueError(
             f'{ERROR_PREFIX} Pipeline can have only one resample operation located in start of the pipeline')
+    return True
 
 
 def get_wrong_links(ts_to_table_operations: list, ts_data_operations: list, non_ts_data_operations: list,