refactor: centralize logging in astrai.logging, replace ASTRAI_TIMED with log level

- move setup_logging to astrai/logging.py
- timed() now uses logger.isEnabledFor(DEBUG) instead of separate env var
- enable ASTR_LOG_LEVEL=DEBUG to see per-step timing logs
- call setup_logging() in stream_chat.py

astrai/__init__.py

@@ -1,9 +1,6 @@
 __version__ = "1.3.13"
 __author__ = "ViperEkura"
 
-import logging
-import os
-
 from astrai.config import (
     AutoRegressiveLMConfig,
     BaseModelConfig,
@@ -28,6 +25,7 @@ from astrai.inference import (
     run_server,
     sample,
 )
+from astrai.logging import setup_logging
 from astrai.model import (
     AutoModel,
     AutoRegressiveLM,
@@ -55,30 +53,6 @@ from astrai.trainer import (
     Trainer,
 )
 
-
-def setup_logging(level: str = "INFO"):
-    """Attach a handler to the ``astrai`` logger (only, not root).
-
-    Call once per process, e.g. at the top of CLI scripts.
-    Set ``ASTR_LOG_LEVEL`` to override the default ``INFO``.
-    """
-    _logger = logging.getLogger("astrai")
-    if _logger.handlers:
-        return
-    _level = getattr(
-        logging, os.environ.get("ASTR_LOG_LEVEL", level).upper(), logging.INFO
-    )
-    _logger.setLevel(_level)
-    _handler = logging.StreamHandler()
-    _handler.setFormatter(
-        logging.Formatter(
-            "%(asctime)s | %(levelname)-7s | %(name)s | %(message)s",
-            datefmt="%Y-%m-%d %H:%M:%S",
-        )
-    )
-    _logger.addHandler(_handler)
-
-
 __all__ = [
     "AutoRegressiveLM",
     "AutoRegressiveLMConfig",
@@ -122,3 +96,5 @@ __all__ = [
     "setup_logging",
     "spawn_parallel_fn",
 ]
+
+setup_logging()