CO3Dv2 trainer configs

Summary:
Adds yaml configs to train selected methods on CO3Dv2.

Few more updates:
1) moved some fields to base classes so that we can check is_multisequence in experiment.py
2) skip loading all train cameras for multisequence datasets, without this, co3d-fewview is untrainable
3) fix bug in json index dataset provider v2

Reviewed By: kjchalup

Differential Revision: D38952755

fbshipit-source-id: 3edac6fc8e20775aa70400bd73a0e6d52b091e0c

projects/implicitron_trainer/tests/experiment.yaml

@@ -406,8 +406,13 @@ optimizer_factory_ImplicitronOptimizerFactory_args:
   linear_exponential_lr_milestone: 200
   linear_exponential_start_gamma: 0.1
 training_loop_ImplicitronTrainingLoop_args:
-  eval_only: false
   evaluator_class_type: ImplicitronEvaluator
+  evaluator_ImplicitronEvaluator_args:
+    is_multisequence: false
+    camera_difficulty_bin_breaks:
+    - 0.97
+    - 0.98
+  eval_only: false
   max_epochs: 1000
   store_checkpoints: true
   store_checkpoints_purge: 1
@@ -420,8 +425,3 @@ training_loop_ImplicitronTrainingLoop_args:
   visdom_env: ''
   visdom_port: 8097
   visdom_server: http://127.0.0.1
-  evaluator_ImplicitronEvaluator_args:
-    camera_difficulty_bin_breaks:
-    - 0.97
-    - 0.98
-    is_multisequence: false

projects/implicitron_trainer/tests/test_experiment.py

@@ -190,6 +190,34 @@ class TestNerfRepro(unittest.TestCase):
             experiment.dump_cfg(cfg)
             experiment_runner.run()
 
+    @unittest.skip("This test runs nerf training on co3d v2 - manyview.")
+    def test_nerf_co3dv2_manyview(self):
+        # Train NERF
+        if not interactive_testing_requested():
+            return
+        with initialize_config_dir(config_dir=str(IMPLICITRON_CONFIGS_DIR)):
+            cfg = compose(
+                config_name="repro_singleseq_v2_nerf",
+                overrides=[],
+            )
+            experiment_runner = experiment.Experiment(**cfg)
+            experiment.dump_cfg(cfg)
+            experiment_runner.run()
+
+    @unittest.skip("This test runs nerformer training on co3d v2 - fewview.")
+    def test_nerformer_co3dv2_fewview(self):
+        # Train NeRFormer
+        if not interactive_testing_requested():
+            return
+        with initialize_config_dir(config_dir=str(IMPLICITRON_CONFIGS_DIR)):
+            cfg = compose(
+                config_name="repro_multiseq_v2_nerformer",
+                overrides=[],
+            )
+            experiment_runner = experiment.Experiment(**cfg)
+            experiment.dump_cfg(cfg)
+            experiment_runner.run()
+
     @unittest.skip("This test checks resuming of the NeRF training.")
     def test_nerf_blender_resume(self):
         # Train one train batch of NeRF, then resume for one more batch.