Expose server host and port in dataset viewer CLI

docs/get-started/rollout-collection.md

@@ -122,7 +122,21 @@ Launch the rollout viewer:
 ng_viewer +jsonl_fpath=results/simple_weather_rollouts.jsonl
 ```
 
-Then visit <http://127.0.0.1:7860>
+The viewer starts on port 7860 and accepts requests only from localhost by default. Visit <http://127.0.0.1:7860> in your browser.
+
+:::{tip}
+**Configuring Network Access**
+
+By default, the viewer accepts requests only from localhost (`server_host=127.0.0.1`). To make it accessible on your local network:
+
+```bash
+# Accept requests from anywhere (e.g., for remote access)
+ng_viewer +jsonl_fpath=results/simple_weather_rollouts.jsonl +server_host=0.0.0.0
+
+# Use a custom port
+ng_viewer +jsonl_fpath=results/simple_weather_rollouts.jsonl +server_port=8080
+```
+:::
 
 The viewer shows each rollout with:
 

docs/reference/cli-commands.md

@@ -243,12 +243,25 @@ Launch a Gradio interface to view and explore dataset rollouts interactively.
 * - `jsonl_fpath`
   - str
   - Filepath to a local JSONL file to view.
+* - `server_host`
+  - str
+  - Network address where the viewer accepts requests. Defaults to `"127.0.0.1"` (localhost only). Set to `"0.0.0.0"` to accept requests from anywhere.
+* - `server_port`
+  - int
+  - Port where the viewer accepts requests. Defaults to `7860`. If the specified port is unavailable, Gradio will search for the next available port.
 ```
 
-**Example**
+**Examples**
 
 ```bash
+# Launch viewer with default settings (accessible from localhost only)
 ng_viewer +jsonl_fpath=weather_rollouts.jsonl
+
+# Accept requests from anywhere (e.g., for remote access)
+ng_viewer +jsonl_fpath=weather_rollouts.jsonl +server_host=0.0.0.0
+
+# Use a custom port
+ng_viewer +jsonl_fpath=weather_rollouts.jsonl +server_port=8080
 ```
 
 ---

nemo_gym/dataset_viewer.py

@@ -212,11 +212,26 @@ class JsonlDatasetViewerConfig(BaseNeMoGymCLIConfig):
     Examples:
 
     ```bash
+    # Launch viewer with default settings (accessible from localhost only)
     ng_viewer +jsonl_fpath=weather_rollouts.jsonl
+
+    # Accept requests from anywhere (e.g., for remote access)
+    ng_viewer +jsonl_fpath=weather_rollouts.jsonl +server_host=0.0.0.0
+
+    # Use a custom port
+    ng_viewer +jsonl_fpath=weather_rollouts.jsonl +server_port=8080
     ```
     """
 
     jsonl_fpath: str = Field(description="Filepath to a local jsonl file to view.")
+    server_host: str | None = Field(
+        default=None,
+        description='Network address where the viewer accepts requests. Defaults to "127.0.0.1" (localhost only). Set to "0.0.0.0" to accept requests from anywhere.',
+    )
+    server_port: int | None = Field(
+        default=None,
+        description="Port where the viewer accepts requests. Defaults to 7860. If the specified port is unavailable, Gradio will search for the next available port.",
+    )
 
 
 def get_aggregate_metrics(data: List[DatasetViewerVerifyResponse]) -> Dict[str, Any]:
@@ -281,4 +296,4 @@ def select_item(value: int):
 def main():  # pragma: no cover
     config = JsonlDatasetViewerConfig.model_validate(get_global_config_dict())
     demo = build_jsonl_dataset_viewer(config)
-    demo.launch(enable_monitoring=False)
+    demo.launch(server_name=config.server_host, server_port=config.server_port, enable_monitoring=False)