openapi: 3.0.0
info:
  title: Reward Model Service
  version: 1.0.0
components:
  schemas:
    Message:
      # TODO: Keep in sync with /chat_completion
      type: object
      properties:
        role:
          type: string
          description: Role of the entity in the message.
        text:
          type: string
          description: Text content of the message.
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
    Completion:
      # TODO: Keep in sync with /chat_completion
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the completion.
        role:
          type: string
        text:
          type: string
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
        tokens:
          type: array
          items:
            type: integer
        logprobs:
          type: array
          items:
            type: number
        finish_reason:
          type: string
    # Not Used in API but this json encoded version will be used in batch callsite
    PromptResponsePair:
      type: object
      properties:
        id:
          type: string
          description: Unique identifier for the prompt-response pair.
        prompt:
          type: array
          items:
            $ref: '#/components/schemas/Message'
        response:
          $ref: '#/components/schemas/Completion'
    # Not Used in API but this json encoded version will be used in batch callsite
    PromptResponseScore:
      type: object
      properties:
        id:
          type: string
          description: Identifier carried over from the user provided id.
        raw_score:
          type: number
          format: float
          description: Raw score before any scoring function is applied.
        score:
          type: number
          format: float
          description: Final score after applying the scoring function.
    BatchRewardModelScoring:
      type: object
      properties:
        job_id:
          type: string
          description: Unique identifier for the job.
        created:
          type: string
          format: date-time
          description: Timestamp when the job was created.
        status:
          type: string
          enum: [started, completed, running]
          description: Current status of the job.
        input_path:
          type: string
          description: User provided input path.
        success_file_path:
          type: string
          description: Path to the success file containing scores.
        error_file_path:
          type: string
          description: Path to the error file.
        metadata:
          type: object
          additionalProperties: true
          description: User provided metadata carried forward in the response.
paths:
  /reward_model_scoring/:
    get:
      summary: Score a pair of prompt and response using a reward model
      description: Take a pair of prompt and responses and score them using a reward model
      parameters:
        - in: query
          name: messages
          schema:
            type: array
            items:
              $ref: '#/components/schemas/Message'
          required: true
        - in: query
          name: response
          schema:
            $ref: '#/components/schemas/Completion'
          required: true
        - in: query
          name: scoring_function
          schema:
            type: string
          required: true
      responses:
        '200':
          description: Scoring completed successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    description: Unique identifier for the scoring request
                  raw_score:
                    type: number
                    format: float
                  score:
                    type: number
                    format: float

  /batch_reward_model_scoring/:
    post:
      summary: Batch score multiple pairs of prompts and responses
      description: Take a pair of prompt and responses and score them using a reward model
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                # TODO: Maybe take local path but api first uploads and generates handle 
                # which is returned in the repsonse.
                prompt_response_path:
                  type: string
                  description: File path for a JSONL where each line is a JSON encoded `PromptResponsePair` object
                scoring_function:
                  type: string
                  description: String used to resolve to the appropriate scoring function from a registry
                metadata:
                  type: object
                  additionalProperties: true
                  description: Metadata to carry forward in the response
      responses:
        '200':
          description: Batch scoring job submitted successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchRewardModelScoring'