feat(log): add TensorBoard support and enhance WandB API key checking

src/experiment_logger/unified_logger.py

@@ -124,6 +124,16 @@ class UnifiedLogger:
         # Save config to disk
         self._save_config()
 
+        # Setup TensorBoard
+        self.writer = None
+        try:
+            from torch.utils.tensorboard import SummaryWriter
+
+            self.writer = SummaryWriter(self.run_dir)
+            self.info("TensorBoard SummaryWriter initialized.")
+        except ImportError:
+            self.warning("tensorboard not installed. Skipping SummaryWriter.")
+
         # Initialize WandB if requested
         if self.use_wandb:
             self._init_wandb(project_name, entity, save_code)
@@ -206,6 +216,16 @@ class UnifiedLogger:
             except Exception as e:
                 self.warning(f"WandB logging failed: {e}")
 
+        # Log to TensorBoard
+        if self.writer is not None:
+            for k, v in metrics.items():
+                if isinstance(v, (int, float, np.floating, np.integer)):
+                    self.writer.add_scalar(k, v, step)
+                elif hasattr(v, "item"):
+                    self.writer.add_scalar(k, v.item(), step)
+                elif isinstance(v, (np.ndarray, jnp.ndarray)) and v.size == 1:
+                    self.writer.add_scalar(k, v.item(), step)
+
         # Buffer for disk storage
         self.metrics_buffer.append(metrics_with_metadata)
 
@@ -331,6 +351,9 @@ class UnifiedLogger:
         # Flush remaining metrics
         self._flush_metrics()
 
+        if self.writer is not None:
+            self.writer.close()
+
         self.info(f"Run complete. Results saved to: {self.run_dir.absolute()}")
 
         # Finish WandB run

src/experiment_logger/wandb_utils.py

@@ -36,6 +36,27 @@ def init_wandb(
     """
     try:
         import wandb
+        import os
+        import sys
+
+        # Robust HPC checking: check for API key
+        has_key = os.environ.get("WANDB_API_KEY") is not None
+        if not has_key:
+            try:
+                # Check if logged in locally via settings/netrc
+                has_key = wandb.setup().settings.api_key is not None
+            except Exception:
+                pass
+
+        is_interactive = sys.stdout.isatty()
+
+        if not has_key and not is_interactive and os.environ.get("WANDB_MODE") != "offline":
+            logger.warning(
+                "WANDB_API_KEY not found and environment is non-interactive. Switching to offline mode."
+            )
+            sync_path = f"runs/{name}" if name else "runs"
+            logger.warning(f"WandB is offline. Use 'wandb sync {sync_path}' to upload logs later.")
+            os.environ["WANDB_MODE"] = "offline"
 
         run = wandb.init(
             project=project,