AssertionError: only one of size and size_divisor should be valid

[NabeelaKausar]

I am trying to use mmsegmentation for segmentation of pathology images on my own new dataset. I have 512x512 patches of images and annotations. I am representing four classes of my new dataset as given below and saving this file in /mmsegmentation/mmseg/datasets import os.path as osp from mmseg.datasets.basesegdataset import BaseSegDataset from mmseg.registry import DATASETS @DATASETS.register_module() class DrosDataset(BaseSegDataset): METAINFO = dict( classes = ('background', 'tumor', 'immunecells', 'epi'),

PALETTE = [[255, 255, 255], [0, 0, 200], [1, 255, 0], [250, 1, 0]])

def __init__(self,
             img_suffix='.png',
             seg_map_suffix='.png',
             reduce_zero_label=False,
             **kwargs) -> None:
    super().__init__(
        img_suffix=img_suffix,
        seg_map_suffix=seg_map_suffix,
        reduce_zero_label=reduce_zero_label,
        **kwargs)

further I have made a file named medicle_dataset.py in /home/mmsegmentation/configs/base/datasets for dataset settings

dataset_type = 'DrosDataset' data_root = '/home/mmsegmentation/data'

crop_size = (512, 512)
train_pipeline = [
dict(type='LoadImageFromFile'), dict(type='LoadAnnotations'),
dict(type='RandomResize',
scale=(2048, 1024),
ratio_range=(0.5, 2.0), keep_ratio=True),
dict(type='RandomCrop',
crop_size=crop_size, cat_max_ratio=0.75),
dict(type='RandomFlip',
prob=0.5),
dict(type='PhotoMetricDistortion'),
dict(type='PackSegInputs')
] test_pipeline = [ dict(type='LoadImageFromFile'),
dict(type='Resize',
scale=(2048, 1024),
keep_ratio=True),

dict(type='LoadAnnotations'),  
dict(type='PackSegInputs')  

] train_dataloader = dict(
batch_size=2,
num_workers=2,
persistent_workers=True,
sampler=dict(type='InfiniteSampler', shuffle=True),
dataset=dict(
type=dataset_type,
data_root=data_root,
data_prefix=dict( img_path='/home/neda/mmsegmentation/data/img_dir/Train', seg_map_path='/home/neda/mmsegmentation/data/ann_dir/train'),
val_dataloader = dict( batch_size=1,
num_workers=4, persistent_workers=True,
sampler=dict(type='DefaultSampler', shuffle=False),
dataset=dict(
type=dataset_type,
data_root=data_root,
data_prefix=dict( img_path='/home/neda/mmsegmentation/data/img_dir/val_train', seg_map_path='/home/neda/mmsegmentation/data/ann_dir/train/val'),
pipeline=test_pipeline))
test_dataloader = val_dataloader

val_evaluator = dict(type='IoUMetric', iou_metrics=['mIoU']) test_evaluator = val_evaluator

### I am getting this error please help File "/home/neda/mmsegmentation/mmseg/model /data_preprocessor.py", line 123, in forward inputs, data_samples = stack_batch( File "/home/neda/mmsegmentation/mmseg/utils/misc.py", line 65, in stack_batch assert (size is not None) ^ (size_divisor is not None),
AssertionError: only one of size and size_divisor should be valid

Thanks for your error report and we appreciate it a lot.

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1. I have searched related issues but cannot get the expected help.
2. The bug has not been fixed in the latest version.

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[yzb2]

Following the stacktrace, it's in data_preprocessor. Only size or size_divisor should be set in your data_preprocessor config. You likely set both. Check your config in your work_dirs to find out the final config.

[narrowsnap]

What is your model config? I meet the same error because I don't set the data_preprocessor in model.

[TheMakiran]

I saw the same error when training the Cityscapes dataset using one of the pre-existing deeplabv3plus models. When I switched to a different model, the error did not appear, and training commenced successfully.

The error occurred when training based on this config file: deeplabv3plus_r50-d8_512x1024_40k_cityscapes.py The error did not occur when training on this config file: deeplabv3plus_r101-d8_4xb2-40k_cityscapes-512x1024.py

[ashutoshsingh0223]

Probably the both the size and size_divisor are not set. Set size=crop_size in the data_preprocessor dict.

[junhaojia]

Remove the "data_preprocessor" configuration option from the configuration file.

[0xD4rky]

This error is due to the code snippet of mmseg/models/data_preprocessor.py

If you set size_divisor = None there, error will be resolved