fix(sdk): Relax the requirement that component inputs/outputs must appear on the command line.

sdk/python/kfp/components/_python_op.py

@@ -529,35 +529,6 @@ def _func_to_component_spec_v2(
     from kfp.components._structures import ExecutorInputPlaceholder
     component_spec = _extract_component_interface(func)
 
-    component_inputs = component_spec.inputs or []
-    component_outputs = component_spec.outputs or []
-
-    outputs_passed_using_func_parameters = [
-        output for output in component_outputs
-        if output._passing_style is not None
-    ]
-    arguments = []
-    for input in component_inputs + outputs_passed_using_func_parameters:
-        flag = "--{}-output-path".format(input.name.replace("_", "-"))
-
-        if input._passing_style in [InputPath, io_types.InputAnnotation]:
-            arguments_for_input = [flag, InputPathPlaceholder(input.name)]
-        elif input._passing_style in [OutputPath, io_types.OutputAnnotation]:
-            arguments_for_input = [flag, OutputPathPlaceholder(input.name)]
-        else:
-            arguments_for_input = [flag, InputValuePlaceholder(input.name)]
-
-        arguments.extend(arguments_for_input)
-
-    # Add output placeholders for return values from func.
-    func_outputs = [
-        output for output in component_outputs
-        if output._passing_style is None
-    ]
-    for output in func_outputs:
-        flag = "--" + output.name.replace("_", "-")
-        arguments.extend([flag, OutputPathPlaceholder(output.name)])
-
     component_spec.implementation=ContainerImplementation(
         container=ContainerSpec(
             image=base_image,
@@ -578,7 +549,7 @@ def _func_to_component_spec_v2(
                 "--executor_input",
                 ExecutorInputPlaceholder(),
                 "--function_to_execute", func.__name__,
-                ] + arguments,
+                ]
         )
     )
     return component_spec

sdk/python/kfp/dsl/_component_bridge.py

@@ -245,13 +245,32 @@ def _create_container_op_from_component_and_arguments(
   _container_op.ContainerOp._DISABLE_REUSABLE_COMPONENT_WARNING = old_warn_value
 
   component_meta = copy.copy(component_spec)
-  task._set_metadata(component_meta)
+  task._set_metadata(component_meta, original_arguments)
   if component_ref:
     component_ref_without_spec = copy.copy(component_ref)
     component_ref_without_spec.spec = None
     task._component_ref = component_ref_without_spec
 
   task._parameter_arguments = resolved_cmd.inputs_consumed_by_value
+  name_to_spec_type = {}
+  if component_meta.inputs:
+    name_to_spec_type = {
+      input.name: input.type
+      for input in component_meta.inputs
+    }
+  if kfp.COMPILING_FOR_V2:
+    for name, spec_type in name_to_spec_type.items():
+      if (name in original_arguments and
+          type_utils.is_parameter_type(spec_type)):
+        task._parameter_arguments[name] = str(original_arguments[name])
+
+  for name in list(task.artifact_arguments.keys()):
+    if name in task._parameter_arguments:
+      del task.artifact_arguments[name]
+
+  for name in list(task.input_artifact_paths.keys()):
+    if name in task._parameter_arguments:
+      del task.input_artifact_paths[name]
 
   # Previously, ContainerOp had strict requirements for the output names, so we
   # had to convert all the names before passing them to the ContainerOp

sdk/python/kfp/dsl/_container_op.py

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
-import inspect
 import re
 import warnings
 from typing import Any, Dict, Iterable, List, TypeVar, Union, Callable, Optional, Sequence
@@ -26,7 +24,7 @@
                                       V1Lifecycle, V1Volume)
 
 import kfp
-from kfp.components import _structures
+from kfp.components import _components, _structures
 from kfp.dsl import _pipeline_param
 from kfp.dsl import dsl_utils
 from kfp.pipeline_spec import pipeline_spec_pb2
@@ -396,7 +394,7 @@ def set_gpu_limit(self, gpu: Union[str,  _pipeline_param.PipelineParam], vendor:
         ignored in v2.
     """
 
-    if not isinstance(gpu,_pipeline_param.PipelineParam) or not isinstance(gpu,_pipeline_param.PipelineParam):      
+    if not isinstance(gpu,_pipeline_param.PipelineParam) or not isinstance(gpu,_pipeline_param.PipelineParam):
       self._validate_positive_number(gpu, 'gpu')
 
       if self._container_spec:
@@ -832,6 +830,11 @@ def __init__(self,
     # used to mark this op with loop arguments
     self.loop_args = None
 
+    # Placeholder for inputs when adding ComponentSpec metadata to this
+    # ContainerOp. This holds inputs defined in ComponentSpec that have
+    # a corresponding PipelineParam.
+    self._component_spec_inputs_with_pipeline_params = []
+
     # attributes specific to `BaseOp`
     self._inputs = []
     self.dependent_names = []
@@ -848,7 +851,7 @@ def inputs(self):
     # called the 1st time (because there are in-place updates to `PipelineParam`
     # during compilation - remove in-place updates for easier debugging?)
     if not self._inputs:
-      self._inputs = []
+      self._inputs = self._component_spec_inputs_with_pipeline_params or []
       # TODO replace with proper k8s obj?
       for key in self.attrs_with_pipelineparams:
         self._inputs += _pipeline_param.extract_pipelineparams_from_any(
@@ -1280,6 +1283,12 @@ def _decorated(*args, **kwargs):
           for name in file_outputs.keys()
       }
 
+    self._set_single_output_attribute()
+
+    self.pvolumes = {}
+    self.add_pvolumes(pvolumes)
+
+  def _set_single_output_attribute(self):
     # Syntactic sugar: Add task.output attribute if the component has a single
     # output.
     # TODO: Currently the "MLPipeline UI Metadata" output is removed from
@@ -1291,9 +1300,6 @@ def _decorated(*args, **kwargs):
     else:
       self.output = _MultipleOutputsError()
 
-    self.pvolumes = {}
-    self.add_pvolumes(pvolumes)
-
   @property
   def is_v2(self):
     return self._is_v2
@@ -1351,17 +1357,42 @@ def immediate_value_pipeline():
         """
     return self._container
 
-  def _set_metadata(self, metadata):
+  def _set_metadata(self, metadata, arguments: Optional[Dict[str, Any]] = None):
     """Passes the ContainerOp the metadata information and configures the right output.
 
     Args:
       metadata (ComponentSpec): component metadata
+      arguments: Dictionary of input arguments to the component.
     """
     if not isinstance(metadata, _structures.ComponentSpec):
       raise ValueError('_set_metadata is expecting ComponentSpec.')
 
     self._metadata = metadata
 
+    if self._metadata.outputs:
+      declared_outputs = {
+          output.name: _pipeline_param.PipelineParam(
+            output.name, op_name=self.name)
+          for output in self._metadata.outputs
+      }
+      self.outputs.update(declared_outputs)
+
+      for output in self._metadata.outputs:
+        if output.name not in self.file_outputs:
+          output_filename = _components._generate_output_file_name(output.name)
+          self.file_outputs[output.name] = output_filename
+
+    if arguments is not None:
+      for input_name, value in arguments.items():
+        self.artifact_arguments[input_name] = str(value)
+        if (isinstance(value, _pipeline_param.PipelineParam)):
+          self._component_spec_inputs_with_pipeline_params.append(value)
+
+        if input_name not in self.input_artifact_paths:
+          input_artifact_path = _components._generate_input_file_name(
+            input_name)
+          self.input_artifact_paths[input_name] = input_artifact_path
+
     if self.file_outputs:
       for output in self.file_outputs.keys():
         output_type = self.outputs[output].param_type
@@ -1370,6 +1401,8 @@ def _set_metadata(self, metadata):
             output_type = output_meta.type
         self.outputs[output].param_type = output_type
 
+    self._set_single_output_attribute()
+
   def add_pvolumes(self, pvolumes: Dict[str, V1Volume] = None):
     """Updates the existing pvolumes dict, extends volumes and volume_mounts and redefines the pvolume attribute.
 
@@ -1411,7 +1444,7 @@ def add_node_selector_constraint(self, label_name: Union[str,  _pipeline_param.P
     Returns:
       self return to allow chained call with other resource specification.
     """
-    if self.container_spec and not(isinstance(label_name, _pipeline_param.PipelineParam) or isinstance(value, _pipeline_param.PipelineParam)): 
+    if self.container_spec and not(isinstance(label_name, _pipeline_param.PipelineParam) or isinstance(value, _pipeline_param.PipelineParam)):
       accelerator_cnt = 1
       if self.container_spec.resources.accelerator.count > 1:
         # Reserve the number if already set.

sdk/python/kfp/v2/compiler_cli_tests/test_data/lightweight_python_functions_v2_pipeline.json

@@ -91,21 +91,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "preprocess",
-              "--message-output-path",
-              "{{$.inputs.parameters['message']}}",
-              "--output-dataset-one-output-path",
-              "{{$.outputs.artifacts['output_dataset_one'].path}}",
-              "--output-dataset-two-output-path",
-              "{{$.outputs.artifacts['output_dataset_two'].path}}",
-              "--output-parameter-output-path",
-              "{{$.outputs.parameters['output_parameter'].output_file}}",
-              "--output-bool-parameter-output-path",
-              "{{$.outputs.parameters['output_bool_parameter'].output_file}}",
-              "--output-dict-parameter-output-path",
-              "{{$.outputs.parameters['output_dict_parameter'].output_file}}",
-              "--output-list-parameter-output-path",
-              "{{$.outputs.parameters['output_list_parameter'].output_file}}"
+              "preprocess"
             ],
             "command": [
               "sh",
@@ -125,23 +111,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "train",
-              "--dataset-one-output-path",
-              "{{$.inputs.artifacts['dataset_one'].path}}",
-              "--dataset-two-output-path",
-              "{{$.inputs.artifacts['dataset_two'].path}}",
-              "--message-output-path",
-              "{{$.inputs.parameters['message']}}",
-              "--input-bool-output-path",
-              "{{$.inputs.parameters['input_bool']}}",
-              "--input-dict-output-path",
-              "{{$.inputs.parameters['input_dict']}}",
-              "--input-list-output-path",
-              "{{$.inputs.parameters['input_list']}}",
-              "--num-steps-output-path",
-              "{{$.inputs.parameters['num_steps']}}",
-              "--model-output-path",
-              "{{$.outputs.artifacts['model'].path}}"
+              "train"
             ],
             "command": [
               "sh",
@@ -260,4 +230,4 @@
   "runtimeConfig": {
     "gcsOutputDirectory": "dummy_root"
   }
-}
+}

sdk/python/kfp/v2/compiler_cli_tests/test_data/lightweight_python_functions_v2_with_outputs.json

@@ -103,13 +103,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "add_numbers",
-              "--first-output-path",
-              "{{$.inputs.parameters['first']}}",
-              "--second-output-path",
-              "{{$.inputs.parameters['second']}}",
-              "--Output",
-              "{{$.outputs.parameters['Output'].output_file}}"
+              "add_numbers"
             ],
             "command": [
               "sh",
@@ -129,13 +123,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "concat_message",
-              "--first-output-path",
-              "{{$.inputs.parameters['first']}}",
-              "--second-output-path",
-              "{{$.inputs.parameters['second']}}",
-              "--Output",
-              "{{$.outputs.parameters['Output'].output_file}}"
+              "concat_message"
             ],
             "command": [
               "sh",
@@ -155,13 +143,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "output_artifact",
-              "--number-output-path",
-              "{{$.inputs.parameters['number']}}",
-              "--message-output-path",
-              "{{$.inputs.parameters['message']}}",
-              "--Output",
-              "{{$.outputs.artifacts['Output'].path}}"
+              "output_artifact"
             ],
             "command": [
               "sh",
@@ -181,15 +163,7 @@
               "--executor_input",
               "{{$}}",
               "--function_to_execute",
-              "output_named_tuple",
-              "--artifact-output-path",
-              "{{$.inputs.artifacts['artifact'].path}}",
-              "--scalar",
-              "{{$.outputs.parameters['scalar'].output_file}}",
-              "--metrics",
-              "{{$.outputs.artifacts['metrics'].path}}",
-              "--model",
-              "{{$.outputs.artifacts['model'].path}}"
+              "output_named_tuple"
             ],
             "command": [
               "sh",
@@ -354,4 +328,4 @@
   "runtimeConfig": {
     "gcsOutputDirectory": "dummy_root"
   }
-}
+}

sdk/python/kfp/v2/compiler_cli_tests/test_data/pipeline_with_custom_job_spec.json

@@ -36,9 +36,7 @@
                         "--executor_input",
                         "{{$}}",
                         "--function_to_execute",
-                        "training_op",
-                        "--input1-output-path",
-                        "{{$.inputs.parameters['input1']}}"
+                        "training_op"
                       ],
                       "command": [
                         "sh",
@@ -62,9 +60,7 @@
                         "--executor_input",
                         "{{$}}",
                         "--function_to_execute",
-                        "training_op",
-                        "--input1-output-path",
-                        "{{$.inputs.parameters['input1']}}"
+                        "training_op"
                       ],
                       "command": [
                         "sh",
@@ -174,4 +170,4 @@
   "runtimeConfig": {
     "gcsOutputDirectory": "dummy_root"
   }
-}
+}