Add format and system prompt to task meta data

src/unitxt/schema.py

@@ -171,6 +171,12 @@ def process(
         task_data["metadata"]["template"] = self.artifact_to_jsonable(
             instance["recipe_metadata"]["template"]
         )
+        task_data["metadata"]["format"] = self.artifact_to_jsonable(
+            instance["recipe_metadata"]["format"]
+        )
+        task_data["metadata"]["system_prompt"] = self.artifact_to_jsonable(
+            instance["recipe_metadata"]["system_prompt"]
+        )
         if "criteria" in task_data and isinstance(task_data["criteria"], Artifact):
             task_data["criteria"] = self.artifact_to_jsonable(task_data["criteria"])
         if constants.demos_field in instance:

src/unitxt/standard.py

@@ -7,10 +7,10 @@
 from .augmentors import Augmentor, NullAugmentor
 from .card import TaskCard
 from .collections_operators import GetLength
-from .dataclass import Field, InternalField, NonPositionalField, OptionalField
+from .dataclass import InternalField, NonPositionalField, OptionalField
 from .deprecation_utils import deprecation
 from .error_utils import UnitxtError
-from .formats import Format, SystemFormat
+from .formats import Format
 from .generator_utils import ReusableGenerator
 from .logging_utils import get_logger
 from .operator import (
@@ -25,7 +25,7 @@
 from .settings_utils import get_constants, get_settings
 from .splitters import ConstantSizeSample, RandomSizeSample, Sampler
 from .stream import MultiStream
-from .system_prompts import EmptySystemPrompt, SystemPrompt
+from .system_prompts import SystemPrompt
 from .task import Task
 from .templates import (
     ApplyRandomTemplate,
@@ -248,7 +248,7 @@ class DatasetRecipe(SourceSequentialOperator):
     card: TaskCard = None
     task: Task = None
     template: Union[Template, List[Template], TemplatesList] = None
-    system_prompt: SystemPrompt = Field(default_factory=EmptySystemPrompt)
+    system_prompt: SystemPrompt = None
     format: Format = None
     serializer: Union[SingleTypeSerializer, List[SingleTypeSerializer]] = None
 
@@ -490,7 +490,10 @@ def reset_pipeline(self):
             if settings.default_format is not None:
                 self.format, _ = fetch_artifact(settings.default_format)
             else:
-                self.format = SystemFormat()
+                self.format, _ = fetch_artifact("formats.empty")
+
+        if self.system_prompt is None:
+            self.system_prompt, _ = fetch_artifact("system_prompts.empty")
 
         if self.card and self.card.preprocess_steps is None:
             self.card.preprocess_steps = []