Testing script

Summary: Implements the test script of NeRF.

Reviewed By: nikhilaravi

Differential Revision: D25684450

fbshipit-source-id: 739169d9df706795814912bb9a15e2e65ac92df8

Author: davnov134

projects/nerf/configs/fern.yaml

@@ -15,6 +15,7 @@ test:
   scene_center: [0.0, 0.0, -2.0]
   n_frames: 100
   fps: 20
+  trajectory_scale: 1.0
 optimizer:
   max_epochs: 37500
   lr: 0.0005

projects/nerf/configs/lego.yaml

@@ -15,6 +15,7 @@ test:
   scene_center: [0.0, 0.0, 0.0]
   n_frames: 100
   fps: 20
+  trajectory_scale: 0.2
 optimizer:
   max_epochs: 20000
   lr: 0.0005

projects/nerf/configs/pt3logo.yaml

@@ -15,6 +15,7 @@ test:
   scene_center: [0.0, 0.0, 0.0]
   n_frames: 100
   fps: 20
+  trajectory_scale: 0.2
 optimizer:
   max_epochs: 100000
   lr: 0.0005

projects/nerf/test_nerf.py

@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+# Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
+import os
+import warnings
+
+import hydra
+import numpy as np
+import torch
+from nerf.dataset import get_nerf_datasets, trivial_collate
+from nerf.eval_video_utils import generate_eval_video_cameras
+from nerf.nerf_renderer import RadianceFieldRenderer
+from nerf.stats import Stats
+from omegaconf import DictConfig
+from PIL import Image
+
+CONFIG_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), "configs")
+
+
+@hydra.main(config_path=CONFIG_DIR, config_name="lego")
+def main(cfg: DictConfig):
+
+    # Device on which to run.
+    if torch.cuda.is_available():
+        device = "cuda"
+    else:
+        warnings.warn(
+            "Please note that although executing on CPU is supported,"
+            + "the testing is unlikely to finish in reasonable time."
+        )
+        device = "cpu"
+
+    # Initialize the Radiance Field model.
+    model = RadianceFieldRenderer(
+        image_size=cfg.data.image_size,
+        n_pts_per_ray=cfg.raysampler.n_pts_per_ray,
+        n_pts_per_ray_fine=cfg.raysampler.n_pts_per_ray,
+        n_rays_per_image=cfg.raysampler.n_rays_per_image,
+        min_depth=cfg.raysampler.min_depth,
+        max_depth=cfg.raysampler.max_depth,
+        stratified=cfg.raysampler.stratified,
+        stratified_test=cfg.raysampler.stratified_test,
+        chunk_size_test=cfg.raysampler.chunk_size_test,
+        n_harmonic_functions_xyz=cfg.implicit_function.n_harmonic_functions_xyz,
+        n_harmonic_functions_dir=cfg.implicit_function.n_harmonic_functions_dir,
+        n_hidden_neurons_xyz=cfg.implicit_function.n_hidden_neurons_xyz,
+        n_hidden_neurons_dir=cfg.implicit_function.n_hidden_neurons_dir,
+        n_layers_xyz=cfg.implicit_function.n_layers_xyz,
+        density_noise_std=cfg.implicit_function.density_noise_std,
+    )
+
+    # Move the model to the relevant device.
+    model.to(device)
+
+    # Resume from the checkpoint.
+    checkpoint_path = os.path.join(hydra.utils.get_original_cwd(), cfg.checkpoint_path)
+    if not os.path.isfile(checkpoint_path):
+        raise ValueError(f"Model checkpoint {checkpoint_path} does not exist!")
+
+    print(f"Loading checkpoint {checkpoint_path}.")
+    loaded_data = torch.load(checkpoint_path)
+    # Do not load the cached xy grid.
+    # - this allows to set an arbitrary evaluation image size.
+    state_dict = {
+        k: v
+        for k, v in loaded_data["model"].items()
+        if "_grid_raysampler._xy_grid" not in k
+    }
+    model.load_state_dict(state_dict, strict=False)
+
+    # Load the test data.
+    if cfg.test.mode == "evaluation":
+        _, _, test_dataset = get_nerf_datasets(
+            dataset_name=cfg.data.dataset_name,
+            image_size=cfg.data.image_size,
+        )
+    elif cfg.test.mode == "export_video":
+        train_dataset, _, _ = get_nerf_datasets(
+            dataset_name=cfg.data.dataset_name,
+            image_size=cfg.data.image_size,
+        )
+        test_dataset = generate_eval_video_cameras(
+            train_dataset,
+            trajectory_type=cfg.test.trajectory_type,
+            up=cfg.test.up,
+            scene_center=cfg.test.scene_center,
+            n_eval_cams=cfg.test.n_frames,
+            trajectory_scale=cfg.test.trajectory_scale,
+        )
+        # store the video in directory (checkpoint_file - extension + '_video')
+        export_dir = os.path.splitext(checkpoint_path)[0] + "_video"
+        os.makedirs(export_dir, exist_ok=True)
+    else:
+        raise ValueError(f"Unknown test mode {cfg.test_mode}.")
+
+    # Init the test dataloader.
+    test_dataloader = torch.utils.data.DataLoader(
+        test_dataset,
+        batch_size=1,
+        shuffle=False,
+        num_workers=0,
+        collate_fn=trivial_collate,
+    )
+
+    if cfg.test.mode == "evaluation":
+        # Init the test stats object.
+        eval_stats = ["mse_coarse", "mse_fine", "psnr_coarse", "psnr_fine", "sec/it"]
+        stats = Stats(eval_stats)
+        stats.new_epoch()
+    elif cfg.test.mode == "export_video":
+        # Init the frame buffer.
+        frame_paths = []
+
+    # Set the model to the eval mode.
+    model.eval()
+
+    # Run the main testing loop.
+    for batch_idx, test_batch in enumerate(test_dataloader):
+        test_image, test_camera, camera_idx = test_batch[0].values()
+        if test_image is not None:
+            test_image = test_image.to(device)
+        test_camera = test_camera.to(device)
+
+        # Activate eval mode of the model (allows to do a full rendering pass).
+        model.eval()
+        with torch.no_grad():
+            test_nerf_out, test_metrics = model(
+                None,  # we do not use pre-cached cameras
+                test_camera,
+                test_image,
+            )
+
+        if cfg.test.mode == "evaluation":
+            # Update stats with the validation metrics.
+            stats.update(test_metrics, stat_set="test")
+            stats.print(stat_set="test")
+
+        elif cfg.test.mode == "export_video":
+            # Store the video frame.
+            frame = test_nerf_out["rgb_fine"][0].detach().cpu()
+            frame_path = os.path.join(export_dir, f"frame_{batch_idx:05d}.png")
+            print(f"Writing {frame_path}.")
+            Image.fromarray((frame.numpy() * 255.0).astype(np.uint8)).save(frame_path)
+            frame_paths.append(frame_path)
+
+    if cfg.test.mode == "evaluation":
+        print(f"Final evaluation metrics on '{cfg.data.dataset_name}':")
+        for stat in eval_stats:
+            stat_value = stats.stats["test"][stat].get_epoch_averages()[0]
+            print(f"{stat:15s}: {stat_value:1.4f}")
+
+    elif cfg.test.mode == "export_video":
+        # Convert the exported frames to a video.
+        video_path = os.path.join(export_dir, "video.mp4")
+        ffmpeg_bin = "ffmpeg"
+        frame_regexp = os.path.join(export_dir, "frame_%05d.png")
+        ffmcmd = (
+            "%s -r %d -i %s -vcodec h264 -f mp4 -y -b 2000k -pix_fmt yuv420p %s"
+            % (ffmpeg_bin, cfg.test.fps, frame_regexp, video_path)
+        )
+        ret = os.system(ffmcmd)
+        if ret != 0:
+            raise RuntimeError("ffmpeg failed!")
+
+
+if __name__ == "__main__":
+    main()