526 lines
19 KiB
Python
526 lines
19 KiB
Python
"""
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Hugging Face Provider Module for ALwrity
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This module provides functions for interacting with Hugging Face's Inference Providers API
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using the Responses API (beta) which provides a unified interface for model interactions.
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Key Features:
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- Text response generation with retry logic
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- Structured JSON response generation with schema validation
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- Comprehensive error handling and logging
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- Automatic API key management
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- Support for various Hugging Face models via Inference Providers
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Best Practices:
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1. Use structured output for complex, multi-field responses
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2. Keep schemas simple and flat to avoid truncation
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3. Set appropriate token limits (8192 for complex outputs)
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4. Use low temperature (0.1-0.3) for consistent structured output
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5. Implement proper error handling in calling functions
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6. Use the Responses API for better compatibility
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Usage Examples:
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# Text response
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result = huggingface_text_response(prompt, temperature=0.7, max_tokens=2048)
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# Structured JSON response
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schema = {
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"type": "object",
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"properties": {
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"tasks": {
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"type": "array",
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"items": {"type": "object", "properties": {...}}
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}
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}
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}
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result = huggingface_structured_json_response(prompt, schema, temperature=0.2, max_tokens=8192)
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Dependencies:
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- openai (for Hugging Face Responses API)
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- tenacity (for retry logic)
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- logging (for debugging)
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- json (for fallback parsing)
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Author: ALwrity Team
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Version: 1.0
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Last Updated: January 2025
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"""
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import os
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import sys
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from pathlib import Path
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import json
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import re
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from typing import Optional, Dict, Any
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from dotenv import load_dotenv
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# Fix the environment loading path - load from backend directory
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current_dir = Path(__file__).parent.parent # services directory
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backend_dir = current_dir.parent # backend directory
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env_path = backend_dir / '.env'
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if env_path.exists():
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load_dotenv(env_path)
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print(f"Loaded .env from: {env_path}")
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else:
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# Fallback to current directory
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load_dotenv()
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print(f"No .env found at {env_path}, using current directory")
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from loguru import logger
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from utils.logger_utils import get_service_logger
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# Use service-specific logger to avoid conflicts
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logger = get_service_logger("huggingface_provider")
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from tenacity import (
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retry,
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retry_if_exception,
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stop_after_attempt,
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wait_random_exponential,
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)
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try:
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from openai import OpenAI
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from openai import NotFoundError
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OPENAI_AVAILABLE = True
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except ImportError:
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OPENAI_AVAILABLE = False
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NotFoundError = Exception
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logger.warn("OpenAI library not available. Install with: pip install openai")
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HF_FALLBACK_MODELS = [
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"openai/gpt-oss-120b:cerebras",
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"moonshotai/Kimi-K2-Instruct-0905:cerebras",
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"meta-llama/Llama-3.1-8B-Instruct:cerebras",
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"mistralai/Mistral-7B-Instruct-v0.3:cerebras",
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]
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def _candidate_model_variants(model: str):
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"""Yield model ids to try for a single logical model preference."""
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if not model:
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return
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yield model
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if ":" in model:
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base_model = model.split(":", 1)[0]
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if base_model:
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yield base_model
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def _fallback_model_sequence(model: str, fallback_models: list = None):
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if fallback_models:
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sequence = [model] + fallback_models
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else:
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sequence = [model]
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seen = set()
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for preferred_model in sequence:
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for candidate in _candidate_model_variants(preferred_model):
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if candidate and candidate not in seen:
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seen.add(candidate)
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yield candidate
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def _is_non_retryable_hf_error(exc: Exception) -> bool:
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"""Skip retries for deterministic HF failures (e.g., unknown model ids, billing)."""
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msg = str(exc).lower()
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status = getattr(exc, "status_code", None)
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if isinstance(exc, NotFoundError) or "not found" in msg or "404" in msg:
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return True
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if status == 402 or "402" in msg or "depleted" in msg or "credits" in msg:
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return True
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if status == 401 or "unauthorized" in msg or "401" in msg:
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return True
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if status == 403 or "forbidden" in msg or "403" in msg:
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return True
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return False
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def _should_retry_hf_error(exc: Exception) -> bool:
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return not _is_non_retryable_hf_error(exc)
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def get_huggingface_api_key() -> str:
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"""Get Hugging Face API key with proper error handling."""
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api_key = os.getenv('HF_TOKEN')
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if not api_key:
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error_msg = "HF_TOKEN environment variable is not set. Please set it in your .env file."
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logger.error(error_msg)
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raise ValueError(error_msg)
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# Validate API key format (basic check)
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if not api_key.startswith('hf_'):
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error_msg = "HF_TOKEN appears to be invalid. It should start with 'hf_'."
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logger.error(error_msg)
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raise ValueError(error_msg)
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return api_key
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@retry(
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retry=retry_if_exception(_should_retry_hf_error),
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wait=wait_random_exponential(min=1, max=60),
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stop=stop_after_attempt(6),
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)
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def huggingface_text_response(
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prompt: str,
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model: str = "openai/gpt-oss-120b:cerebras",
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fallback_models: list = None,
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temperature: float = 0.7,
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max_tokens: int = 2048,
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top_p: float = 0.9,
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system_prompt: Optional[str] = None
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) -> str:
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"""
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Generate text response using Hugging Face Inference Providers API.
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This function uses the Hugging Face Responses API which provides a unified interface
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for model interactions with built-in retry logic and error handling.
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Args:
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prompt (str): The input prompt for the AI model
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model (str): Hugging Face model identifier (default: "openai/gpt-oss-120b:cerebras")
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fallback_models (list, optional): Explicit fallback models to try
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temperature (float): Controls randomness (0.0-1.0)
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max_tokens (int): Maximum tokens in response
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top_p (float): Nucleus sampling parameter (0.0-1.0)
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system_prompt (str, optional): System instruction for the model
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Returns:
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str: Generated text response
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Raises:
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Exception: If API key is missing or API call fails
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Example:
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result = huggingface_text_response(
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prompt="Write a blog post about AI",
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model="openai/gpt-oss-120b:cerebras",
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temperature=0.7,
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max_tokens=2048,
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system_prompt="You are a professional content writer."
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)
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"""
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try:
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if not OPENAI_AVAILABLE:
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raise ImportError("OpenAI library not available. Install with: pip install openai")
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# Get API key with proper error handling
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api_key = get_huggingface_api_key()
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logger.info(f"🔑 Hugging Face API key loaded: {bool(api_key)} (length: {len(api_key) if api_key else 0})")
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if not api_key:
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raise Exception("HF_TOKEN not found in environment variables")
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# Initialize Hugging Face client
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client = OpenAI(
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base_url=f"https://router.huggingface.co/hf/v1",
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api_key=api_key,
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)
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logger.info("✅ Hugging Face client initialized for text response")
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# Prepare input for the API
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messages = []
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# Add system prompt if provided
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if system_prompt:
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messages.append({
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"role": "system",
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"content": system_prompt
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})
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# Add user prompt
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messages.append({
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"role": "user",
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"content": prompt
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})
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# Add debugging for API call
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logger.info(
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"Hugging Face text call | model={} | prompt_len={} | temp={} | top_p={} | max_tokens={}",
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model,
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len(prompt) if isinstance(prompt, str) else '<non-str>',
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temperature,
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top_p,
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max_tokens,
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)
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logger.info("🚀 Making Hugging Face API call (chat completion)...")
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response = None
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last_error = None
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for candidate_model in _fallback_model_sequence(model):
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try:
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response = client.chat.completions.create(
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model=candidate_model,
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messages=messages,
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temperature=temperature,
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top_p=top_p,
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max_tokens=max_tokens
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)
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if candidate_model != model:
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logger.warning("HF text generation switched to fallback model: {}", candidate_model)
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break
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except NotFoundError as nf_err:
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last_error = nf_err
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logger.warning("HF model not found: {}. Trying fallback model.", candidate_model)
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continue
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if response is None:
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raise last_error or Exception("Hugging Face text generation failed: all fallback models failed")
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# Extract text from response
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generated_text = response.choices[0].message.content
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# Clean up the response
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if generated_text:
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# Remove any markdown formatting if present
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generated_text = re.sub(r'```[a-zA-Z]*\n?', '', generated_text)
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generated_text = re.sub(r'```\n?', '', generated_text)
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generated_text = generated_text.strip()
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logger.info(f"✅ Hugging Face text response generated successfully (length: {len(generated_text)})")
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return generated_text
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except Exception as e:
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logger.error(f"❌ Hugging Face text generation failed: {str(e)}")
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raise Exception(f"Hugging Face text generation failed: {str(e)}")
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@retry(wait=wait_random_exponential(min=1, max=60), stop=stop_after_attempt(6))
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def huggingface_structured_json_response(
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prompt: str,
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schema: Dict[str, Any],
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model: str = "openai/gpt-oss-120b:groq",
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temperature: float = 0.7,
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max_tokens: int = 8192,
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system_prompt: Optional[str] = None
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) -> Dict[str, Any]:
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"""
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Generate structured JSON response using Hugging Face Inference Providers API.
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This function uses the Hugging Face Responses API with structured output support
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to generate JSON responses that match a provided schema.
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Args:
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prompt (str): The input prompt for the AI model
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schema (dict): JSON schema defining the expected output structure
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model (str): Hugging Face model identifier (default: "openai/gpt-oss-120b:groq")
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temperature (float): Controls randomness (0.0-1.0). Use 0.1-0.3 for structured output
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max_tokens (int): Maximum tokens in response. Use 8192 for complex outputs
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system_prompt (str, optional): System instruction for the model
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Returns:
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dict: Parsed JSON response matching the provided schema
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Raises:
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Exception: If API key is missing or API call fails
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Best Practices:
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- Keep schemas simple and flat to avoid truncation
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- Use low temperature (0.1-0.3) for consistent structured output
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- Set max_tokens to 8192 for complex multi-field responses
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- Avoid deeply nested schemas with many required fields
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- Test with smaller outputs first, then scale up
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Example:
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schema = {
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"type": "object",
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"properties": {
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"tasks": {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"title": {"type": "string"},
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"description": {"type": "string"}
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}
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}
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}
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}
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}
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result = huggingface_structured_json_response(prompt, schema, temperature=0.2, max_tokens=8192)
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"""
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try:
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if not OPENAI_AVAILABLE:
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raise ImportError("OpenAI library not available. Install with: pip install openai")
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# Get API key with proper error handling
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api_key = get_huggingface_api_key()
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logger.info(f"🔑 Hugging Face API key loaded: {bool(api_key)} (length: {len(api_key) if api_key else 0})")
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if not api_key:
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raise Exception("HF_TOKEN not found in environment variables")
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# Initialize OpenAI client with Hugging Face base URL
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# Use standard Inference API endpoint
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client = OpenAI(
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base_url=f"https://router.huggingface.co/hf/v1",
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api_key=api_key,
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)
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logger.info("✅ Hugging Face client initialized for structured JSON response")
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# Prepare input for the API
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messages = []
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# Add system prompt if provided
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if system_prompt:
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messages.append({
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"role": "system",
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"content": system_prompt
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})
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# Add user prompt with JSON instruction
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# For HF models, explicit JSON instruction in prompt is often better than response_format
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json_instruction = "Please respond with valid JSON that matches the provided schema."
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messages.append({
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"role": "user",
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"content": f"{prompt}\n\n{json_instruction}"
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})
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# Add debugging for API call
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logger.info(
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"Hugging Face structured call | model={} | prompt_len={} | schema_kind={} | temp={} | max_tokens={}",
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model,
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len(prompt) if isinstance(prompt, str) else '<non-str>',
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type(schema).__name__,
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temperature,
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max_tokens,
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)
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logger.info("🚀 Making Hugging Face structured API call...")
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# Make the API call using standard Chat Completions
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logger.info("🚀 Making Hugging Face API call (chat completion)...")
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# Add JSON schema to prompt for guidance
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json_schema_str = json.dumps(schema, indent=2)
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messages[-1]["content"] += f"\n\nJSON Schema:\n{json_schema_str}"
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try:
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response = None
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last_error = None
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for candidate_model in _fallback_model_sequence(model):
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try:
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response = client.chat.completions.create(
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model=candidate_model,
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messages=messages,
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temperature=temperature,
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max_tokens=max_tokens,
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response_format={"type": "json_object"} # Try to enforce JSON mode if supported
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)
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if candidate_model != model:
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logger.warning("HF structured generation switched to fallback model: {}", candidate_model)
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break
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except NotFoundError as nf_err:
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last_error = nf_err
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logger.warning("HF structured model not found: {}. Trying fallback model.", candidate_model)
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continue
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if response is None:
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raise last_error or Exception("Hugging Face structured generation failed: all fallback models failed")
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response_text = response.choices[0].message.content
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# Clean up response text if needed
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response_text = response_text.strip()
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if response_text.startswith("```json"):
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response_text = response_text[7:]
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if response_text.endswith("```"):
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response_text = response_text[:-3]
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response_text = response_text.strip()
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try:
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parsed_json = json.loads(response_text)
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logger.info("✅ Hugging Face structured JSON response parsed successfully")
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return parsed_json
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except json.JSONDecodeError as json_err:
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logger.error(f"❌ JSON parsing failed: {json_err}")
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logger.error(f"Raw response: {response_text}")
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# Try to extract JSON from the response using regex
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json_match = re.search(r'\{.*\}', response_text, re.DOTALL)
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if json_match:
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try:
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extracted_json = json.loads(json_match.group())
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logger.info("✅ JSON extracted using regex fallback")
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return extracted_json
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except json.JSONDecodeError:
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pass
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return {"error": "Failed to parse JSON response", "raw_response": response_text}
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except Exception as e:
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logger.error(f"❌ Hugging Face API call failed: {e}")
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if "422" in str(e) or "not supported" in str(e).lower() or isinstance(e, NotFoundError):
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logger.info("Retrying without response_format...")
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response = None
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last_error = None
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for candidate_model in _fallback_model_sequence(model, fallback_models):
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try:
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response = client.chat.completions.create(
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model=candidate_model,
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messages=messages,
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temperature=temperature,
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max_tokens=max_tokens
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)
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if candidate_model != model:
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logger.warning("HF structured no-response_format fallback model: {}", candidate_model)
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break
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except NotFoundError as nf_err:
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last_error = nf_err
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logger.warning("HF structured model not found (no response_format path): {}", candidate_model)
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continue
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if response is None:
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raise last_error or e
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response_text = response.choices[0].message.content
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try:
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return json.loads(response_text)
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except:
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json_match = re.search(r'\{.*\}', response_text, re.DOTALL)
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if json_match:
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return json.loads(json_match.group())
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return {"error": "Failed to parse JSON response", "raw_response": response_text}
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raise e
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except Exception as e:
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error_msg = str(e) if str(e) else repr(e)
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error_type = type(e).__name__
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logger.error(f"❌ Hugging Face structured JSON generation failed: {error_type}: {error_msg}")
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logger.error(f"❌ Full exception details: {repr(e)}")
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import traceback
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logger.error(f"❌ Traceback: {traceback.format_exc()}")
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raise Exception(f"Hugging Face structured JSON generation failed: {error_type}: {error_msg}")
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def get_available_models() -> list:
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"""
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Get list of available Hugging Face models for text generation.
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Returns:
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list: List of available model identifiers
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"""
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return [
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"openai/gpt-oss-120b:cerebras",
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"moonshotai/Kimi-K2-Instruct-0905:cerebras",
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"Qwen/Qwen2.5-VL-7B-Instruct",
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"meta-llama/Llama-3.1-8B-Instruct:cerebras",
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"microsoft/Phi-3-medium-4k-instruct:cerebras",
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"mistralai/Mistral-7B-Instruct-v0.3:cerebras"
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]
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def validate_model(model: str) -> bool:
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"""
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Validate if a model identifier is supported.
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Args:
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model (str): Model identifier to validate
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Returns:
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bool: True if model is supported, False otherwise
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"""
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available_models = get_available_models()
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return model in available_models
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