diff --git a/projects/implicitron_trainer/configs/repro_base.yaml b/projects/implicitron_trainer/configs/repro_base.yaml
index 11ebdc9e..112d269f 100644
--- a/projects/implicitron_trainer/configs/repro_base.yaml
+++ b/projects/implicitron_trainer/configs/repro_base.yaml
@@ -3,6 +3,7 @@ defaults:
 - _self_
 exp_dir: ./data/exps/base/
 training_loop_ImplicitronTrainingLoop_args:
+  visdom_port: 8097
   visualize_interval: 0
   max_epochs: 1000
 data_source_ImplicitronDataSource_args:
@@ -22,7 +23,6 @@ data_source_ImplicitronDataSource_args:
       mask_depths: false
       mask_images: false
 model_factory_ImplicitronModelFactory_args:
-  visdom_port: 8097
   model_GenericModel_args:
     loss_weights:
       loss_mask_bce: 1.0
diff --git a/projects/implicitron_trainer/experiment.py b/projects/implicitron_trainer/experiment.py
index a9e429fc..b5411091 100755
--- a/projects/implicitron_trainer/experiment.py
+++ b/projects/implicitron_trainer/experiment.py
@@ -147,9 +147,6 @@ class Experiment(Configurable):  # pyre-ignore: 13
         run_auto_creation(self)
 
     def run(self) -> None:
-        # Make sure the config settings are self-consistent.
-        self._check_config_consistent()
-
         # Initialize the accelerator if desired.
         if no_accelerate:
             accelerator = None
@@ -176,9 +173,11 @@ class Experiment(Configurable):  # pyre-ignore: 13
             exp_dir=self.exp_dir,
         )
 
-        stats = self.model_factory.load_stats(
-            exp_dir=self.exp_dir,
+        stats = self.training_loop.load_stats(
             log_vars=model.log_vars,
+            exp_dir=self.exp_dir,
+            resume=self.model_factory.resume,
+            resume_epoch=self.model_factory.resume_epoch,  # pyre-ignore [16]
         )
         start_epoch = stats.epoch + 1
 
@@ -190,6 +189,8 @@ class Experiment(Configurable):  # pyre-ignore: 13
             exp_dir=self.exp_dir,
             last_epoch=start_epoch,
             model=model,
+            resume=self.model_factory.resume,
+            resume_epoch=self.model_factory.resume_epoch,
         )
 
         # Wrap all modules in the distributed library
@@ -224,26 +225,6 @@ class Experiment(Configurable):  # pyre-ignore: 13
             seed=self.seed,
         )
 
-    def _check_config_consistent(self) -> None:
-        if hasattr(self.optimizer_factory, "resume") and hasattr(
-            self.model_factory, "resume"
-        ):
-            assert (
-                # pyre-ignore [16]
-                not self.optimizer_factory.resume
-                # pyre-ignore [16]
-                or self.model_factory.resume
-            ), "Cannot resume the optimizer without resuming the model."
-        if hasattr(self.optimizer_factory, "resume_epoch") and hasattr(
-            self.model_factory, "resume_epoch"
-        ):
-            assert (
-                # pyre-ignore [16]
-                self.optimizer_factory.resume_epoch
-                # pyre-ignore [16]
-                == self.model_factory.resume_epoch
-            ), "Optimizer and model must resume from the same epoch."
-
 
 def _setup_envvars_for_cluster() -> bool:
     """
diff --git a/projects/implicitron_trainer/impl/model_factory.py b/projects/implicitron_trainer/impl/model_factory.py
index 728f7d57..9c8ea9da 100644
--- a/projects/implicitron_trainer/impl/model_factory.py
+++ b/projects/implicitron_trainer/impl/model_factory.py
@@ -6,13 +6,13 @@
 
 import logging
 import os
-from typing import List, Optional
+from typing import Optional
 
 import torch.optim
 
 from accelerate import Accelerator
 from pytorch3d.implicitron.models.base_model import ImplicitronModelBase
-from pytorch3d.implicitron.tools import model_io, vis_utils
+from pytorch3d.implicitron.tools import model_io
 from pytorch3d.implicitron.tools.config import (
     registry,
     ReplaceableBase,
@@ -24,6 +24,9 @@ logger = logging.getLogger(__name__)
 
 
 class ModelFactoryBase(ReplaceableBase):
+
+    resume: bool = True  # resume from the last checkpoint
+
     def __call__(self, **kwargs) -> ImplicitronModelBase:
         """
         Initialize the model (possibly from a previously saved state).
@@ -45,27 +48,22 @@ class ImplicitronModelFactory(ModelFactoryBase):  # pyre-ignore [13]
     A factory class that initializes an implicit rendering model.
 
     Members:
-        force_load: If True, throw a FileNotFoundError if `resume` is True but
-            a model checkpoint cannot be found.
         model: An ImplicitronModelBase object.
         resume: If True, attempt to load the last checkpoint from `exp_dir`
             passed to __call__. Failure to do so will return a model with ini-
-            tial weights unless `force_load` is True.
+            tial weights unless `force_resume` is True.
         resume_epoch: If `resume` is True: Resume a model at this epoch, or if
             `resume_epoch` <= 0, then resume from the latest checkpoint.
-        visdom_env: The name of the Visdom environment to use for plotting.
-        visdom_port: The Visdom port.
-        visdom_server: Address of the Visdom server.
+        force_resume: If True, throw a FileNotFoundError if `resume` is True but
+            a model checkpoint cannot be found.
+
     """
 
-    force_load: bool = False
     model: ImplicitronModelBase
     model_class_type: str = "GenericModel"
-    resume: bool = False
+    resume: bool = True
     resume_epoch: int = -1
-    visdom_env: str = ""
-    visdom_port: int = int(os.environ.get("VISDOM_PORT", 8097))
-    visdom_server: str = "http://127.0.0.1"
+    force_resume: bool = False
 
     def __post_init__(self):
         run_auto_creation(self)
@@ -87,24 +85,27 @@ class ImplicitronModelFactory(ModelFactoryBase):  # pyre-ignore [13]
             model: The model with optionally loaded weights from checkpoint
 
         Raise:
-            FileNotFoundError if `force_load` is True but checkpoint not found.
+            FileNotFoundError if `force_resume` is True but checkpoint not found.
         """
         # Determine the network outputs that should be logged
         if hasattr(self.model, "log_vars"):
-            log_vars = list(self.model.log_vars)  # pyre-ignore [6]
+            log_vars = list(self.model.log_vars)
         else:
             log_vars = ["objective"]
 
-        # Retrieve the last checkpoint
         if self.resume_epoch > 0:
+            # Resume from a certain epoch
             model_path = model_io.get_checkpoint(exp_dir, self.resume_epoch)
+            if not os.path.isfile(model_path):
+                raise ValueError(f"Cannot find model from epoch {self.resume_epoch}.")
         else:
+            # Retrieve the last checkpoint
             model_path = model_io.find_last_checkpoint(exp_dir)
 
         if model_path is not None:
-            logger.info("found previous model %s" % model_path)
-            if self.force_load or self.resume:
-                logger.info("   -> resuming")
+            logger.info(f"Found previous model {model_path}")
+            if self.force_resume or self.resume:
+                logger.info("Resuming.")
 
                 map_location = None
                 if accelerator is not None and not accelerator.is_local_main_process:
@@ -120,81 +121,13 @@ class ImplicitronModelFactory(ModelFactoryBase):  # pyre-ignore [13]
                 except RuntimeError as e:
                     logger.error(e)
                     logger.info(
-                        "Cant load state dict in strict mode! -> trying non-strict"
+                        "Cannot load state dict in strict mode! -> trying non-strict"
                     )
                     self.model.load_state_dict(model_state_dict, strict=False)
-                self.model.log_vars = log_vars  # pyre-ignore [16]
+                self.model.log_vars = log_vars
             else:
-                logger.info("   -> but not resuming -> starting from scratch")
-        elif self.force_load:
+                logger.info("Not resuming -> starting from scratch.")
+        elif self.force_resume:
             raise FileNotFoundError(f"Cannot find a checkpoint in {exp_dir}!")
 
         return self.model
-
-    def load_stats(
-        self,
-        log_vars: List[str],
-        exp_dir: str,
-        clear_stats: bool = False,
-        **kwargs,
-    ) -> Stats:
-        """
-        Load Stats that correspond to the model's log_vars.
-
-        Args:
-            log_vars: A list of variable names to log. Should be a subset of the
-                `preds` returned by the forward function of the corresponding
-                ImplicitronModelBase instance.
-            exp_dir: Root experiment directory.
-            clear_stats: If True, do not load stats from the checkpoint speci-
-                fied by self.resume and self.resume_epoch; instead, create a
-                fresh stats object.
-
-        stats: The stats structure (optionally loaded from checkpoint)
-        """
-        # Init the stats struct
-        visdom_env_charts = (
-            vis_utils.get_visdom_env(self.visdom_env, exp_dir) + "_charts"
-        )
-        stats = Stats(
-            # log_vars should be a list, but OmegaConf might load them as ListConfig
-            list(log_vars),
-            plot_file=os.path.join(exp_dir, "train_stats.pdf"),
-            visdom_env=visdom_env_charts,
-            verbose=False,
-            visdom_server=self.visdom_server,
-            visdom_port=self.visdom_port,
-        )
-        if self.resume_epoch > 0:
-            model_path = model_io.get_checkpoint(exp_dir, self.resume_epoch)
-        else:
-            model_path = model_io.find_last_checkpoint(exp_dir)
-
-        if model_path is not None:
-            stats_path = model_io.get_stats_path(model_path)
-            stats_load = model_io.load_stats(stats_path)
-
-            # Determine if stats should be reset
-            if not clear_stats:
-                if stats_load is None:
-                    logger.warning("\n\n\n\nCORRUPT STATS -> clearing stats\n\n\n\n")
-                    last_epoch = model_io.parse_epoch_from_model_path(model_path)
-                    logger.info(f"Estimated resume epoch = {last_epoch}")
-
-                    # Reset the stats struct
-                    for _ in range(last_epoch + 1):
-                        stats.new_epoch()
-                    assert last_epoch == stats.epoch
-                else:
-                    stats = stats_load
-
-                # Update stats properties incase it was reset on load
-                stats.visdom_env = visdom_env_charts
-                stats.visdom_server = self.visdom_server
-                stats.visdom_port = self.visdom_port
-                stats.plot_file = os.path.join(exp_dir, "train_stats.pdf")
-                stats.synchronize_logged_vars(log_vars)
-            else:
-                logger.info("   -> clearing stats")
-
-        return stats
diff --git a/projects/implicitron_trainer/impl/optimizer_factory.py b/projects/implicitron_trainer/impl/optimizer_factory.py
index 74de28c0..88547481 100644
--- a/projects/implicitron_trainer/impl/optimizer_factory.py
+++ b/projects/implicitron_trainer/impl/optimizer_factory.py
@@ -60,11 +60,6 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
         multistep_lr_milestones: With MultiStepLR policy only: list of
             increasing epoch indices at which the learning rate is modified.
         momentum: Momentum factor for SGD optimizer.
-        resume: If True, attempt to load the last checkpoint from `exp_dir`
-            passed to __call__. Failure to do so will return a newly initialized
-            optimizer.
-        resume_epoch: If `resume` is True: Resume optimizer at this epoch. If
-            `resume_epoch` <= 0, then resume from the latest checkpoint.
         weight_decay: The optimizer weight_decay (L2 penalty on model weights).
     """
 
@@ -76,8 +71,6 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
     lr_policy: str = "MultiStepLR"
     momentum: float = 0.9
     multistep_lr_milestones: tuple = ()
-    resume: bool = False
-    resume_epoch: int = -1
     weight_decay: float = 0.0
 
     def __post_init__(self):
@@ -89,6 +82,8 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
         model: ImplicitronModelBase,
         accelerator: Optional[Accelerator] = None,
         exp_dir: Optional[str] = None,
+        resume: bool = True,
+        resume_epoch: int = -1,
         **kwargs,
     ) -> Tuple[torch.optim.Optimizer, Any]:
         """
@@ -100,7 +95,10 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
             model: The model with optionally loaded weights.
             accelerator: An optional Accelerator instance.
             exp_dir: Root experiment directory.
-
+            resume: If True, attempt to load optimizer checkpoint from exp_dir.
+                Failure to do so will return a newly initialized optimizer.
+            resume_epoch: If `resume` is True: Resume optimizer at this epoch. If
+                `resume_epoch` <= 0, then resume from the latest checkpoint.
         Returns:
             An optimizer module (optionally loaded from a checkpoint) and
             a learning rate scheduler module (should be a subclass of torch.optim's
@@ -131,13 +129,18 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
                 p_groups, lr=self.lr, betas=self.betas, weight_decay=self.weight_decay
             )
         else:
-            raise ValueError("no such solver type %s" % self.breed)
-        logger.info("  -> solver type = %s" % self.breed)
+            raise ValueError(f"No such solver type {self.breed}")
+        logger.info(f"Solver type = {self.breed}")
 
         # Load state from checkpoint
-        optimizer_state = self._get_optimizer_state(exp_dir, accelerator)
+        optimizer_state = self._get_optimizer_state(
+            exp_dir,
+            accelerator,
+            resume_epoch=resume_epoch,
+            resume=resume,
+        )
         if optimizer_state is not None:
-            logger.info("  -> setting loaded optimizer state")
+            logger.info("Setting loaded optimizer state.")
             optimizer.load_state_dict(optimizer_state)
 
         # Initialize the learning rate scheduler
@@ -169,20 +172,31 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
         self,
         exp_dir: Optional[str],
         accelerator: Optional[Accelerator] = None,
+        resume: bool = True,
+        resume_epoch: int = -1,
     ) -> Optional[Dict[str, Any]]:
         """
         Load an optimizer state from a checkpoint.
+
+        resume: If True, attempt to load the last checkpoint from `exp_dir`
+            passed to __call__. Failure to do so will return a newly initialized
+            optimizer.
+        resume_epoch: If `resume` is True: Resume optimizer at this epoch. If
+            `resume_epoch` <= 0, then resume from the latest checkpoint.
         """
-        if exp_dir is None or not self.resume:
+        if exp_dir is None or not resume:
             return None
-        if self.resume_epoch > 0:
-            save_path = model_io.get_checkpoint(exp_dir, self.resume_epoch)
+        if resume_epoch > 0:
+            save_path = model_io.get_checkpoint(exp_dir, resume_epoch)
+            if not os.path.isfile(save_path):
+                raise FileNotFoundError(
+                    f"Cannot find optimizer from epoch {resume_epoch}."
+                )
         else:
             save_path = model_io.find_last_checkpoint(exp_dir)
         optimizer_state = None
         if save_path is not None:
-            logger.info(f"Found previous optimizer state {save_path}.")
-            logger.info("   -> resuming")
+            logger.info(f"Found previous optimizer state {save_path} -> resuming.")
             opt_path = model_io.get_optimizer_path(save_path)
 
             if os.path.isfile(opt_path):
@@ -193,5 +207,5 @@ class ImplicitronOptimizerFactory(OptimizerFactoryBase):
                     }
                 optimizer_state = torch.load(opt_path, map_location)
             else:
-                optimizer_state = None
+                raise FileNotFoundError(f"Optimizer state {opt_path} does not exist.")
         return optimizer_state
diff --git a/projects/implicitron_trainer/impl/training_loop.py b/projects/implicitron_trainer/impl/training_loop.py
index caafafd7..e9b56c5d 100644
--- a/projects/implicitron_trainer/impl/training_loop.py
+++ b/projects/implicitron_trainer/impl/training_loop.py
@@ -5,8 +5,9 @@
 # LICENSE file in the root directory of this source tree.
 
 import logging
+import os
 import time
-from typing import Any, Optional
+from typing import Any, List, Optional
 
 import torch
 from accelerate import Accelerator
@@ -41,6 +42,16 @@ class TrainingLoopBase(ReplaceableBase):
     ) -> None:
         raise NotImplementedError()
 
+    def load_stats(
+        self,
+        log_vars: List[str],
+        exp_dir: str,
+        resume: bool = True,
+        resume_epoch: int = -1,
+        **kwargs,
+    ) -> Stats:
+        raise NotImplementedError()
+
 
 @registry.register
 class ImplicitronTrainingLoop(TrainingLoopBase):  # pyre-ignore [13]
@@ -64,6 +75,9 @@ class ImplicitronTrainingLoop(TrainingLoopBase):  # pyre-ignore [13]
             logged.
         visualize_interval: The batch interval at which the visualizations
             should be plotted
+        visdom_env: The name of the Visdom environment to use for plotting.
+        visdom_port: The Visdom port.
+        visdom_server: Address of the Visdom server.
     """
 
     # Parameters of the outer training loop.
@@ -77,10 +91,15 @@ class ImplicitronTrainingLoop(TrainingLoopBase):  # pyre-ignore [13]
     test_when_finished: bool = False
     validation_interval: int = 1
 
-    # Parameters of a single training-validation step.
+    # Gradient clipping.
     clip_grad: float = 0.0
+
+    # Visualization/logging parameters.
     metric_print_interval: int = 5
     visualize_interval: int = 1000
+    visdom_env: str = ""
+    visdom_port: int = int(os.environ.get("VISDOM_PORT", 8097))
+    visdom_server: str = "http://127.0.0.1"
 
     def __post_init__(self):
         run_auto_creation(self)
@@ -202,6 +221,81 @@ class ImplicitronTrainingLoop(TrainingLoopBase):  # pyre-ignore [13]
                     "Cannot evaluate and dump results to json, no test data provided."
                 )
 
+    def load_stats(
+        self,
+        log_vars: List[str],
+        exp_dir: str,
+        resume: bool = True,
+        resume_epoch: int = -1,
+        **kwargs,
+    ) -> Stats:
+        """
+        Load Stats that correspond to the model's log_vars and resume_epoch.
+
+        Args:
+            log_vars: A list of variable names to log. Should be a subset of the
+                `preds` returned by the forward function of the corresponding
+                ImplicitronModelBase instance.
+            exp_dir: Root experiment directory.
+            resume: If False, do not load stats from the checkpoint speci-
+                fied by resume and resume_epoch; instead, create a fresh stats object.
+
+        stats: The stats structure (optionally loaded from checkpoint)
+        """
+        # Init the stats struct
+        visdom_env_charts = (
+            vis_utils.get_visdom_env(self.visdom_env, exp_dir) + "_charts"
+        )
+        stats = Stats(
+            # log_vars should be a list, but OmegaConf might load them as ListConfig
+            list(log_vars),
+            visdom_env=visdom_env_charts,
+            verbose=False,
+            visdom_server=self.visdom_server,
+            visdom_port=self.visdom_port,
+        )
+
+        model_path = None
+        if resume:
+            if resume_epoch > 0:
+                model_path = model_io.get_checkpoint(exp_dir, resume_epoch)
+                if not os.path.isfile(model_path):
+                    raise FileNotFoundError(
+                        f"Cannot find stats from epoch {resume_epoch}."
+                    )
+            else:
+                model_path = model_io.find_last_checkpoint(exp_dir)
+
+        if model_path is not None:
+            stats_path = model_io.get_stats_path(model_path)
+            stats_load = model_io.load_stats(stats_path)
+
+            # Determine if stats should be reset
+            if resume:
+                if stats_load is None:
+                    logger.warning("\n\n\n\nCORRUPT STATS -> clearing stats\n\n\n\n")
+                    last_epoch = model_io.parse_epoch_from_model_path(model_path)
+                    logger.info(f"Estimated resume epoch = {last_epoch}")
+
+                    # Reset the stats struct
+                    for _ in range(last_epoch + 1):
+                        stats.new_epoch()
+                    assert last_epoch == stats.epoch
+                else:
+                    logger.info(f"Found previous stats in {stats_path} -> resuming.")
+                    stats = stats_load
+
+                # Update stats properties incase it was reset on load
+                stats.visdom_env = visdom_env_charts
+                stats.visdom_server = self.visdom_server
+                stats.visdom_port = self.visdom_port
+                stats.plot_file = os.path.join(exp_dir, "train_stats.pdf")
+                stats.synchronize_logged_vars(log_vars)
+            else:
+                logger.info("Clearing stats")
+
+        return stats
+
     def _training_or_validation_epoch(
         self,
         epoch: int,
diff --git a/projects/implicitron_trainer/tests/experiment.yaml b/projects/implicitron_trainer/tests/experiment.yaml
index f810426b..fade4c45 100644
--- a/projects/implicitron_trainer/tests/experiment.yaml
+++ b/projects/implicitron_trainer/tests/experiment.yaml
@@ -124,14 +124,32 @@ data_source_ImplicitronDataSource_args:
     dataset_length_val: 0
     dataset_length_test: 0
 model_factory_ImplicitronModelFactory_args:
-  force_load: false
+  resume: true
   model_class_type: GenericModel
-  resume: false
   resume_epoch: -1
-  visdom_env: ''
-  visdom_port: 8097
-  visdom_server: http://127.0.0.1
+  force_resume: false
   model_GenericModel_args:
+    log_vars:
+    - loss_rgb_psnr_fg
+    - loss_rgb_psnr
+    - loss_rgb_mse
+    - loss_rgb_huber
+    - loss_depth_abs
+    - loss_depth_abs_fg
+    - loss_mask_neg_iou
+    - loss_mask_bce
+    - loss_mask_beta_prior
+    - loss_eikonal
+    - loss_density_tv
+    - loss_depth_neg_penalty
+    - loss_autodecoder_norm
+    - loss_prev_stage_rgb_mse
+    - loss_prev_stage_rgb_psnr_fg
+    - loss_prev_stage_rgb_psnr
+    - loss_prev_stage_mask_bce
+    - objective
+    - epoch
+    - sec/it
     mask_images: true
     mask_depths: true
     render_image_width: 400
@@ -162,27 +180,6 @@ model_factory_ImplicitronModelFactory_args:
       loss_prev_stage_rgb_mse: 1.0
       loss_mask_bce: 0.0
       loss_prev_stage_mask_bce: 0.0
-    log_vars:
-    - loss_rgb_psnr_fg
-    - loss_rgb_psnr
-    - loss_rgb_mse
-    - loss_rgb_huber
-    - loss_depth_abs
-    - loss_depth_abs_fg
-    - loss_mask_neg_iou
-    - loss_mask_bce
-    - loss_mask_beta_prior
-    - loss_eikonal
-    - loss_density_tv
-    - loss_depth_neg_penalty
-    - loss_autodecoder_norm
-    - loss_prev_stage_rgb_mse
-    - loss_prev_stage_rgb_psnr_fg
-    - loss_prev_stage_rgb_psnr
-    - loss_prev_stage_mask_bce
-    - objective
-    - epoch
-    - sec/it
     global_encoder_HarmonicTimeEncoder_args:
       n_harmonic_functions: 10
       append_input: true
@@ -422,8 +419,6 @@ optimizer_factory_ImplicitronOptimizerFactory_args:
   lr_policy: MultiStepLR
   momentum: 0.9
   multistep_lr_milestones: []
-  resume: false
-  resume_epoch: -1
   weight_decay: 0.0
 training_loop_ImplicitronTrainingLoop_args:
   eval_only: false
@@ -437,6 +432,9 @@ training_loop_ImplicitronTrainingLoop_args:
   clip_grad: 0.0
   metric_print_interval: 5
   visualize_interval: 1000
+  visdom_env: ''
+  visdom_port: 8097
+  visdom_server: http://127.0.0.1
   evaluator_ImplicitronEvaluator_args:
     camera_difficulty_bin_breaks:
     - 0.97
diff --git a/projects/implicitron_trainer/tests/test_experiment.py b/projects/implicitron_trainer/tests/test_experiment.py
index 6e2d321d..4a045898 100644
--- a/projects/implicitron_trainer/tests/test_experiment.py
+++ b/projects/implicitron_trainer/tests/test_experiment.py
@@ -5,6 +5,7 @@
 # LICENSE file in the root directory of this source tree.
 
 import os
+import tempfile
 import unittest
 from pathlib import Path
 
@@ -172,3 +173,48 @@ class TestNerfRepro(unittest.TestCase):
             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.
+        # Set env vars BLENDER_DATASET_ROOT and BLENDER_SINGLESEQ_CLASS first!
+        if not interactive_testing_requested():
+            return
+        with initialize_config_dir(config_dir=str(IMPLICITRON_CONFIGS_DIR)):
+            with tempfile.TemporaryDirectory() as exp_dir:
+                cfg = compose(config_name="repro_singleseq_nerf_blender", overrides=[])
+                cfg.exp_dir = exp_dir
+
+                # set dataset len to 1
+
+                # fmt: off
+                (
+                    cfg
+                    .data_source_ImplicitronDataSource_args
+                    .data_loader_map_provider_SequenceDataLoaderMapProvider_args
+                    .dataset_length_train
+                ) = 1
+                # fmt: on
+
+                # run for one epoch
+                cfg.training_loop_ImplicitronTrainingLoop_args.max_epochs = 1
+                experiment_runner = experiment.Experiment(**cfg)
+                experiment.dump_cfg(cfg)
+                experiment_runner.run()
+
+                # update num epochs + 2, let the optimizer resume
+                cfg.training_loop_ImplicitronTrainingLoop_args.max_epochs = 3
+                experiment_runner = experiment.Experiment(**cfg)
+                experiment_runner.run()
+
+                # start from scratch
+                cfg.model_factory_ImplicitronModelFactory_args.resume = False
+                experiment_runner = experiment.Experiment(**cfg)
+                experiment_runner.run()
+
+                # force resume from epoch 1
+                cfg.model_factory_ImplicitronModelFactory_args.resume = True
+                cfg.model_factory_ImplicitronModelFactory_args.force_resume = True
+                cfg.model_factory_ImplicitronModelFactory_args.resume_epoch = 1
+                experiment_runner = experiment.Experiment(**cfg)
+                experiment_runner.run()
diff --git a/projects/implicitron_trainer/visualize_reconstruction.py b/projects/implicitron_trainer/visualize_reconstruction.py
index f4bb543d..929f61b5 100644
--- a/projects/implicitron_trainer/visualize_reconstruction.py
+++ b/projects/implicitron_trainer/visualize_reconstruction.py
@@ -344,7 +344,7 @@ def export_scenes(
 
     # Load the previously trained model
     experiment = Experiment(config)
-    model = experiment.model_factory(force_load=True, load_model_only=True)
+    model = experiment.model_factory(force_resume=True)
     model.cuda()
     model.eval()
 
diff --git a/pytorch3d/implicitron/models/base_model.py b/pytorch3d/implicitron/models/base_model.py
index 2e5bce2c..ec34caed 100644
--- a/pytorch3d/implicitron/models/base_model.py
+++ b/pytorch3d/implicitron/models/base_model.py
@@ -4,7 +4,7 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Any, Dict, List, Optional
 
 import torch
@@ -45,6 +45,10 @@ class ImplicitronModelBase(ReplaceableBase, torch.nn.Module):
     optimization.
     """
 
+    # The keys from `preds` (output of ImplicitronModelBase.forward) to be logged in
+    # the training loop.
+    log_vars: List[str] = field(default_factory=lambda: ["objective"])
+
     def __init__(self) -> None:
         super().__init__()
 
diff --git a/tests/implicitron/data/overrides.yaml b/tests/implicitron/data/overrides.yaml
index 667225e7..7224626c 100644
--- a/tests/implicitron/data/overrides.yaml
+++ b/tests/implicitron/data/overrides.yaml
@@ -1,3 +1,24 @@
+log_vars:
+- loss_rgb_psnr_fg
+- loss_rgb_psnr
+- loss_rgb_mse
+- loss_rgb_huber
+- loss_depth_abs
+- loss_depth_abs_fg
+- loss_mask_neg_iou
+- loss_mask_bce
+- loss_mask_beta_prior
+- loss_eikonal
+- loss_density_tv
+- loss_depth_neg_penalty
+- loss_autodecoder_norm
+- loss_prev_stage_rgb_mse
+- loss_prev_stage_rgb_psnr_fg
+- loss_prev_stage_rgb_psnr
+- loss_prev_stage_mask_bce
+- objective
+- epoch
+- sec/it
 mask_images: true
 mask_depths: true
 render_image_width: 400
@@ -28,27 +49,6 @@ loss_weights:
   loss_prev_stage_rgb_mse: 1.0
   loss_mask_bce: 0.0
   loss_prev_stage_mask_bce: 0.0
-log_vars:
-- loss_rgb_psnr_fg
-- loss_rgb_psnr
-- loss_rgb_mse
-- loss_rgb_huber
-- loss_depth_abs
-- loss_depth_abs_fg
-- loss_mask_neg_iou
-- loss_mask_bce
-- loss_mask_beta_prior
-- loss_eikonal
-- loss_density_tv
-- loss_depth_neg_penalty
-- loss_autodecoder_norm
-- loss_prev_stage_rgb_mse
-- loss_prev_stage_rgb_psnr_fg
-- loss_prev_stage_rgb_psnr
-- loss_prev_stage_mask_bce
-- objective
-- epoch
-- sec/it
 global_encoder_SequenceAutodecoder_args:
   autodecoder_args:
     encoding_dim: 0
diff --git a/tests/implicitron/test_config_use.py b/tests/implicitron/test_config_use.py
index e3b63147..9cb455da 100644
--- a/tests/implicitron/test_config_use.py
+++ b/tests/implicitron/test_config_use.py
@@ -90,5 +90,5 @@ class TestGenericModel(unittest.TestCase):
         remove_unused_components(instance_args)
         yaml = OmegaConf.to_yaml(instance_args, sort_keys=False)
         if DEBUG:
-            (DATA_DIR / "overrides.yaml_").write_text(yaml)
+            (DATA_DIR / "overrides_.yaml").write_text(yaml)
         self.assertEqual(yaml, (DATA_DIR / "overrides.yaml").read_text())