extract dataparser configs to a stand-alone file, support custom dataparsers (#1909)

* extract dataparser configs to a stand-alone file, support custom dataparsers

* add license

* fix pylint issues

* fix type error issue

* update naming; add documentations;

* print f string

* fix pylint issue

---------

Co-authored-by: Matthew Tancik <tancik@berkeley.edu>

nerfstudio/plugins/registry.py

@@ -40,15 +40,15 @@ def discover_methods() -> t.Tuple[t.Dict[str, TrainerConfig], t.Dict[str, str]]:
     descriptions = {}
     discovered_entry_points = entry_points(group="nerfstudio.method_configs")
     for name in discovered_entry_points.names:
-        specification = discovered_entry_points[name].load()
-        if not isinstance(specification, MethodSpecification):
+        spec = discovered_entry_points[name].load()
+        if not isinstance(spec, MethodSpecification):
             CONSOLE.print(
-                "[bold yellow]Warning: Could not entry point {n} as it is not an instance of MethodSpecification"
+                f"[bold yellow]Warning: Could not entry point {spec} as it is not an instance of MethodSpecification"
             )
             continue
-        specification = t.cast(MethodSpecification, specification)
-        methods[specification.config.method_name] = specification.config
-        descriptions[specification.config.method_name] = specification.description
+        spec = t.cast(MethodSpecification, spec)
+        methods[spec.config.method_name] = spec.config
+        descriptions[spec.config.method_name] = spec.description
 
     if "NERFSTUDIO_METHOD_CONFIGS" in os.environ:
         try:

nerfstudio/plugins/registry_dataparser.py

@@ -0,0 +1,61 @@
+# Copyright 2022 The Nerfstudio Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Module that keeps all registered plugins and allows for plugin discovery.
+"""
+
+import sys
+import typing as t
+from dataclasses import dataclass
+
+from rich.progress import Console
+
+from nerfstudio.data.dataparsers.base_dataparser import DataParserConfig
+
+if sys.version_info < (3, 10):
+    from importlib_metadata import entry_points
+else:
+    from importlib.metadata import entry_points
+CONSOLE = Console(width=120)
+
+
+@dataclass
+class DataParserSpecification:
+    """
+    DataParser specification class used to register custom dataparsers with Nerfstudio.
+    The registered dataparsers will be available in commands such as `ns-train`
+    """
+
+    config: DataParserConfig
+    """Dataparser configuration"""
+
+
+def discover_dataparsers() -> t.Dict[str, DataParserConfig]:
+    """
+    Discovers all dataparsers registered using the `nerfstudio.dataparser_configs` entrypoint.
+    """
+    dataparsers = {}
+    discovered_entry_points = entry_points(group="nerfstudio.dataparser_configs")
+    for name in discovered_entry_points.names:
+        spec = discovered_entry_points[name].load()
+        if not isinstance(spec, DataParserSpecification):
+            CONSOLE.print(
+                f"[bold yellow]Warning: Could not entry point {spec} as it is an instance of DataParserSpecification"
+            )
+            continue
+        spec = t.cast(DataParserSpecification, spec)
+        dataparsers[name] = spec.config
+
+    return dataparsers