add logging for expectation function

Author: MPMPMPMPMPMPMP

varipeps/config.py

@@ -325,6 +325,7 @@ class VariPEPS_Config:
     log_level_optimizer: LogLevel = LogLevel.INFO
     log_level_ctmrg: LogLevel = LogLevel.INFO
     log_level_line_search: LogLevel = LogLevel.INFO
+    log_level_expectation: LogLevel = LogLevel.INFO
     log_to_console: bool = True
     log_to_file: bool = False
     log_file: str = "varipeps.log"

varipeps/utils/logging_config.py

@@ -64,6 +64,9 @@ def init_logging(cfg: Any | None = None) -> None:
     logging.getLogger("varipeps.line_search").setLevel(
         _to_py_log_level(getattr(cfg, "log_level_line_search", logging.INFO))
     )
+    logging.getLogger("varipeps.expectation").setLevel(
+        _to_py_log_level(getattr(cfg, "log_level_expectation", logging.INFO))
+    )
 
     _LOGGING_INITIALIZED = True