NEW: wandb log to logger (#816)

CHANGELOG.md

@@ -33,7 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Make native prediction intervals for DeepAR ([#761](https://github.com/tinkoff-ai/etna/pull/761))
 - Make native prediction intervals for TFTModel ([#770](https://github.com/tinkoff-ai/etna/pull/770))
 - Test cases for testing inference of models ([#794](https://github.com/tinkoff-ai/etna/pull/794))
-- 
+- Wandb.log to WandbLogger ([#816](https://github.com/tinkoff-ai/etna/pull/816))
 ### Fixed
 - 
 - Fix missing prophet in docker images ([#767](https://github.com/tinkoff-ai/etna/pull/767))

etna/loggers/wandb_logger.py

@@ -101,10 +101,10 @@ def log(self, msg: Union[str, Dict[str, Any]], **kwargs):
 
         Notes
         -----
-        We log nothing via current method in wandb case.
-        Currently you could call ``wandb.log`` by hand if you need this.
+        We log dictionary to wandb only.
         """
-        pass
+        if isinstance(msg, dict):
+            self.experiment.log(msg)
 
     def log_backtest_metrics(
         self, ts: "TSDataset", metrics_df: pd.DataFrame, forecast_df: pd.DataFrame, fold_info_df: pd.DataFrame

tests/test_loggers/test_wandb_logger.py

@@ -0,0 +1,29 @@
+from unittest.mock import call
+from unittest.mock import patch
+
+import pytest
+
+from etna.loggers import WandbLogger
+from etna.loggers import tslogger as _tslogger
+
+
+@pytest.fixture()
+def tslogger():
+    _tslogger.loggers = []
+    yield _tslogger
+    _tslogger.loggers = []
+
+
+@patch("etna.loggers.wandb_logger.wandb")
+def test_wandb_logger_log(wandb, tslogger):
+    wandb_logger = WandbLogger()
+    tslogger.add(wandb_logger)
+    tslogger.log("test")
+    tslogger.log({"MAE": 0})
+    tslogger.log({"MAPE": 1.5})
+    calls = [
+        call({"MAE": 0}),
+        call({"MAPE": 1.5}),
+    ]
+    assert wandb.init.return_value.log.call_count == 2
+    wandb.init.return_value.log.assert_has_calls(calls)