refactor: simplify training and inference interfaces

- avoid constructing model_fn more than once when reading config
- keep inference package exports focused on public entry points
- rename extra strategy arguments to strategy_kwargs

astrai/__init__.py

@@ -17,14 +17,9 @@ from astrai.dataset import (
     StoreFactory,
 )
 from astrai.factory import BaseFactory
-from astrai.inference import (
-    InferenceEngine,
-    ProtocolHandler,
-    SamplingPipeline,
-    get_app,
-    run_server,
-    sample,
-)
+from astrai.inference import InferenceEngine, get_app, run_server, sample
+from astrai.inference.network import ProtocolHandler
+from astrai.inference.runtime.sample import SamplingPipeline
 from astrai.logging import setup_logging
 from astrai.model import (
     AutoModel,

astrai/config/train_config.py

@@ -70,7 +70,7 @@ class TrainConfig(BaseConfig):
         rollout_max_tokens (int): Maximum generated tokens per response in rollout. Defaults to 1024.
         reward_model_fn (Optional[Callable]): Factory for reward model, required for online RL strategies. Defaults to None.
         executor_kwargs (Dict[str, Any]): Extra kwargs passed to ExecutorFactory.create(). Defaults to {}.
-        extra_kwargs (Dict[str, Any]): Other arguments. Defaults to {}.
+        strategy_kwargs (Dict[str, Any]): Extra strategy arguments. Defaults to {}.
     """
 
     model_fn: Callable[[], nn.Module]
@@ -125,7 +125,7 @@ class TrainConfig(BaseConfig):
     reward_model_fn: Optional[Callable] = None
 
     executor_kwargs: Dict[str, Any] = field(default_factory=dict)
-    extra_kwargs: Dict[str, Any] = field(default_factory=dict)
+    strategy_kwargs: Dict[str, Any] = field(default_factory=dict)
 
     @field_validator("strategy")
     def _validate_strategy(cls, v: str) -> str:

astrai/inference/__init__.py

@@ -12,45 +12,10 @@ Modules:
   - engine.py:     Facade (InferenceEngine)
 """
 
-from astrai.inference.cache import (
-    Allocator,
-    KVCache,
-    KVStorage,
-    PagePool,
-    RadixCache,
-    ReqToTokenPool,
-    TaskCacheManager,
-    page_hash,
-)
 from astrai.inference.engine import InferenceEngine
-from astrai.inference.network import (
-    AnthropicMessage,
-    BaseToolParser,
-    ChatCompletionRequest,
-    ChatMessage,
-    FunctionDef,
-    GenContext,
-    MessagesRequest,
-    ProtocolHandler,
-    SimpleJsonToolParser,
-    StopChecker,
-    ToolDef,
-    ToolParserFactory,
-    get_app,
-    run_server,
-)
-from astrai.inference.network.anthropic import AnthropicResponseBuilder
-from astrai.inference.network.openai import OpenAIResponseBuilder
+from astrai.inference.network import get_app, run_server
 from astrai.inference.runtime.executor import Executor
-from astrai.inference.runtime.sample import (
-    BaseSamplingStrategy,
-    FrequencyPenaltyStrategy,
-    SamplingPipeline,
-    TemperatureStrategy,
-    TopKStrategy,
-    TopPStrategy,
-    sample,
-)
+from astrai.inference.runtime.sample import sample
 from astrai.inference.scheduler import InferenceScheduler
 from astrai.inference.task import STOP, Task, TaskManager, TaskStatus
 
@@ -62,35 +27,7 @@ __all__ = [
     "Task",
     "TaskManager",
     "TaskStatus",
-    "Allocator",
-    "KVCache",
-    "KVStorage",
-    "PagePool",
-    "RadixCache",
-    "ReqToTokenPool",
-    "TaskCacheManager",
-    "page_hash",
     "sample",
-    "BaseSamplingStrategy",
-    "TemperatureStrategy",
-    "TopKStrategy",
-    "TopPStrategy",
-    "FrequencyPenaltyStrategy",
-    "SamplingPipeline",
-    "ProtocolHandler",
-    "StopChecker",
-    "GenContext",
-    "BaseToolParser",
-    "SimpleJsonToolParser",
-    "ToolParserFactory",
-    "OpenAIResponseBuilder",
-    "AnthropicResponseBuilder",
-    "ChatMessage",
-    "ChatCompletionRequest",
-    "FunctionDef",
-    "ToolDef",
-    "AnthropicMessage",
-    "MessagesRequest",
     "get_app",
     "run_server",
 ]

astrai/trainer/strategy.py

@@ -184,7 +184,7 @@ class BaseStrategy(ABC):
         self.executor = kwargs.pop("executor", None)
         self.moe_aux_loss_coef = kwargs.pop("moe_aux_loss_coef", 0.01)
         self._moe_metrics: Dict[str, float] = {}
-        self.extra_kwargs = kwargs
+        self.strategy_kwargs = kwargs
         self._rollout_runner = None
 
     def compute_loss(self, batch: Dict[str, Tensor]) -> Tensor:

astrai/trainer/train_context.py

@@ -140,8 +140,10 @@ class TrainContextBuilder:
                         checkpoint.consumed_samples // per_step * per_step
                     )
                     state.checkpoint = checkpoint
-        if not state.model_config and hasattr(cfg.model_fn(), "config"):
-            state.model_config = cfg.model_fn().config.to_dict()
+        if not state.model_config:
+            model = cfg.model_fn()
+            if hasattr(model, "config"):
+                state.model_config = model.config.to_dict()
         return state
 
     def _create_context(
@@ -260,7 +262,7 @@ class TrainContextBuilder:
 
     def _create_strategy(self, context: TrainContext, executor: BaseExecutor) -> dict:
         cfg = self.config
-        kwargs = dict(cfg.extra_kwargs)
+        kwargs = dict(cfg.strategy_kwargs)
         kwargs.setdefault("moe_aux_loss_coef", cfg.moe_aux_loss_coef)
         if cfg.strategy in ("dpo", "grpo", "online_grpo", "online_dpo"):
             kwargs["ref_model"] = create_ref_model(