[Evals API] [1/n] Initial API (#287)

* type system api

* datasets api

* fix

* datasetio api

* kill reward scoring

* scoring functions + evals

* move jobs, fix errors

llama_stack/apis/scoring/__init__.py

@@ -0,0 +1,7 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from .scoring import *  # noqa: F401 F403

llama_stack/apis/scoring/scoring.py

@@ -0,0 +1,46 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import Any, Dict, List, Protocol, runtime_checkable
+
+from llama_models.schema_utils import json_schema_type, webmethod
+from pydantic import BaseModel
+
+from llama_models.llama3.api.datatypes import *  # noqa: F403
+from llama_stack.apis.scoring_functions import *  # noqa: F403
+
+
+ScoringResult = Dict[str, Any]
+
+
+@json_schema_type
+class ScoreBatchResponse(BaseModel):
+    dataset_id: str
+
+
+@json_schema_type
+class ScoreResponse(BaseModel):
+    # each key in the dict is a scoring function name
+    results: List[Dict[str, ScoringResult]]
+
+
+class ScoringFunctionStore(Protocol):
+    def get_scoring_function(self, name: str) -> ScoringFunctionDefWithProvider: ...
+
+
+@runtime_checkable
+class Scoring(Protocol):
+    scoring_function_store: ScoringFunctionStore
+
+    @webmethod(route="/scoring/score_batch")
+    async def score_batch(
+        self, dataset_id: str, scoring_functions: List[str]
+    ) -> ScoreBatchResponse: ...
+
+    @webmethod(route="/scoring/score")
+    async def score(
+        self, input_rows: List[Dict[str, Any]], scoring_functions: List[str]
+    ) -> ScoreResponse: ...