en doc of uisualization_feature_map.md (#2715)
## Motivation En doc for visualization_feature_map.md and index.rst ## Modification Add new file and change index.rstpull/3042/head
jinxianwei
GitHub
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@ -18,3 +18,4 @@ Useful Tools
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visualization.md
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useful_tools.md
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deployment.md
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visualization_feature_map.md
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@ -0,0 +1,201 @@
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# Wandb Feature Map Visualization
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MMSegmentation 1.x provides backend support for Weights & Biases to facilitate visualization and management of project code results.
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## Wandb Configuration
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Install Weights & Biases following [official instructions](https://docs.wandb.ai/quickstart) e.g.
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```shell
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pip install wandb
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wandb login
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```
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Add `WandbVisBackend` in `vis_backend` of `visualizer` in `default_runtime.py` config file:
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```python
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vis_backends=[dict(type='LocalVisBackend'),
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dict(type='TensorboardVisBackend'),
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dict(type='WandbVisBackend')]
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```
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## Examining feature map visualization in Wandb
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`SegLocalVisualizer` is child class inherits from `Visualizer` in MMEngine and works for MMSegmentation visualization, for more details about `Visualizer` please refer to [visualization tutorial](https://github.com/open-mmlab/mmengine/blob/main/docs/en/advanced_tutorials/visualization.md) in MMEngine.
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Here is an example about `SegLocalVisualizer`, first you may download example data below by following commands:
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<div align=center>
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<img src="https://user-images.githubusercontent.com/24582831/189833109-eddad58f-f777-4fc0-b98a-6bd429143b06.png" width="70%"/>
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</div>
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```shell
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wget https://user-images.githubusercontent.com/24582831/189833109-eddad58f-f777-4fc0-b98a-6bd429143b06.png --output-document aachen_000000_000019_leftImg8bit.png
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wget https://user-images.githubusercontent.com/24582831/189833143-15f60f8a-4d1e-4cbb-a6e7-5e2233869fac.png --output-document aachen_000000_000019_gtFine_labelTrainIds.png
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wget https://download.openmmlab.com/mmsegmentation/v0.5/ann/ann_r50-d8_512x1024_40k_cityscapes/ann_r50-d8_512x1024_40k_cityscapes_20200605_095211-049fc292.pth
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```
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```python
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# Copyright (c) OpenMMLab. All rights reserved.
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from argparse import ArgumentParser
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from typing import Type
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import mmcv
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import torch
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import torch.nn as nn
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from mmengine.model import revert_sync_batchnorm
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from mmengine.structures import PixelData
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from mmseg.apis import inference_model, init_model
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from mmseg.structures import SegDataSample
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from mmseg.utils import register_all_modules
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from mmseg.visualization import SegLocalVisualizer
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class Recorder:
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"""record the forward output feature map and save to data_buffer."""
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def __init__(self) -> None:
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self.data_buffer = list()
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def __enter__(self, ):
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self._data_buffer = list()
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def record_data_hook(self, model: nn.Module, input: Type, output: Type):
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self.data_buffer.append(output)
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def __exit__(self, *args, **kwargs):
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pass
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def visualize(args, model, recorder, result):
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seg_visualizer = SegLocalVisualizer(
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vis_backends=[dict(type='WandbVisBackend')],
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save_dir='temp_dir',
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alpha=0.5)
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seg_visualizer.dataset_meta = dict(
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classes=model.dataset_meta['classes'],
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palette=model.dataset_meta['palette'])
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image = mmcv.imread(args.img, 'color')
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seg_visualizer.add_datasample(
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name='predict',
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image=image,
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data_sample=result,
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draw_gt=False,
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draw_pred=True,
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wait_time=0,
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out_file=None,
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show=False)
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# add feature map to wandb visualizer
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for i in range(len(recorder.data_buffer)):
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feature = recorder.data_buffer[i][0] # remove the batch
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drawn_img = seg_visualizer.draw_featmap(
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feature, image, channel_reduction='select_max')
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seg_visualizer.add_image(f'feature_map{i}', drawn_img)
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if args.gt_mask:
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sem_seg = mmcv.imread(args.gt_mask, 'unchanged')
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sem_seg = torch.from_numpy(sem_seg)
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gt_mask = dict(data=sem_seg)
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gt_mask = PixelData(**gt_mask)
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data_sample = SegDataSample()
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data_sample.gt_sem_seg = gt_mask
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seg_visualizer.add_datasample(
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name='gt_mask',
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image=image,
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data_sample=data_sample,
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draw_gt=True,
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draw_pred=False,
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wait_time=0,
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out_file=None,
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show=False)
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seg_visualizer.add_image('image', image)
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def main():
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parser = ArgumentParser(
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description='Draw the Feature Map During Inference')
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parser.add_argument('img', help='Image file')
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parser.add_argument('config', help='Config file')
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parser.add_argument('checkpoint', help='Checkpoint file')
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parser.add_argument('--gt_mask', default=None, help='Path of gt mask file')
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parser.add_argument('--out-file', default=None, help='Path to output file')
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parser.add_argument(
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'--device', default='cuda:0', help='Device used for inference')
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parser.add_argument(
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'--opacity',
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type=float,
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default=0.5,
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help='Opacity of painted segmentation map. In (0, 1] range.')
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parser.add_argument(
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'--title', default='result', help='The image identifier.')
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args = parser.parse_args()
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register_all_modules()
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# build the model from a config file and a checkpoint file
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model = init_model(args.config, args.checkpoint, device=args.device)
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if args.device == 'cpu':
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model = revert_sync_batchnorm(model)
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# show all named module in the model and use it in source list below
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for name, module in model.named_modules():
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print(name)
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source = [
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'decode_head.fusion.stages.0.query_project.activate',
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'decode_head.context.stages.0.key_project.activate',
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'decode_head.context.bottleneck.activate'
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]
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source = dict.fromkeys(source)
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count = 0
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recorder = Recorder()
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# registry the forward hook
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for name, module in model.named_modules():
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if name in source:
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count += 1
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module.register_forward_hook(recorder.record_data_hook)
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if count == len(source):
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break
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with recorder:
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# test a single image, and record feature map to data_buffer
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result = inference_model(model, args.img)
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visualize(args, model, recorder, result)
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if __name__ == '__main__':
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main()
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```
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Save the above code as feature_map_visual.py and execute the following code in terminal
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```shell
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python feature_map_visual.py ${image} ${config} ${checkpoint} [optional args]
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```
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e.g
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```shell
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python feature_map_visual.py \
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aachen_000000_000019_leftImg8bit.png \
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configs/ann/ann_r50-d8_4xb2-40k_cityscapes-512x1024.py \
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ann_r50-d8_512x1024_40k_cityscapes_20200605_095211-049fc292.pth \
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--gt_mask aachen_000000_000019_gtFine_labelTrainIds.png
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```
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The visualized image result and its corresponding reature map will appear in the wandb account.
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<div align=center>
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<img src="https://user-images.githubusercontent.com/76149310/217520321-647f5bf9-eef2-446d-a9e8-5ca7b621d500.png">
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</div>
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