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362 lines
10 KiB
362 lines
10 KiB
# Big Transfer (BiT)
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**Big Transfer (BiT)** is a type of pretraining recipe that pre-trains on a large supervised source dataset, and fine-tunes the weights on the target task. Models are trained on the JFT-300M dataset. The finetuned models contained in this collection are finetuned on ImageNet.
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## How do I use this model on an image?
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To load a pretrained model:
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```py
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>>> import timm
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>>> model = timm.create_model('resnetv2_101x1_bitm', pretrained=True)
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>>> model.eval()
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```
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To load and preprocess the image:
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```py
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>>> import urllib
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>>> from PIL import Image
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>>> from timm.data import resolve_data_config
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>>> from timm.data.transforms_factory import create_transform
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>>> config = resolve_data_config({}, model=model)
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>>> transform = create_transform(**config)
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>>> url, filename = ("https://github.com/pytorch/hub/raw/master/images/dog.jpg", "dog.jpg")
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>>> urllib.request.urlretrieve(url, filename)
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>>> img = Image.open(filename).convert('RGB')
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>>> tensor = transform(img).unsqueeze(0) # transform and add batch dimension
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```
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To get the model predictions:
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```py
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>>> import torch
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>>> with torch.no_grad():
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... out = model(tensor)
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>>> probabilities = torch.nn.functional.softmax(out[0], dim=0)
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>>> print(probabilities.shape)
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>>> # prints: torch.Size([1000])
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```
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To get the top-5 predictions class names:
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```py
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>>> # Get imagenet class mappings
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>>> url, filename = ("https://raw.githubusercontent.com/pytorch/hub/master/imagenet_classes.txt", "imagenet_classes.txt")
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>>> urllib.request.urlretrieve(url, filename)
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>>> with open("imagenet_classes.txt", "r") as f:
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... categories = [s.strip() for s in f.readlines()]
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>>> # Print top categories per image
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>>> top5_prob, top5_catid = torch.topk(probabilities, 5)
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>>> for i in range(top5_prob.size(0)):
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... print(categories[top5_catid[i]], top5_prob[i].item())
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>>> # prints class names and probabilities like:
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>>> # [('Samoyed', 0.6425196528434753), ('Pomeranian', 0.04062102362513542), ('keeshond', 0.03186424449086189), ('white wolf', 0.01739676296710968), ('Eskimo dog', 0.011717947199940681)]
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```
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Replace the model name with the variant you want to use, e.g. `resnetv2_101x1_bitm`. You can find the IDs in the model summaries at the top of this page.
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To extract image features with this model, follow the [timm feature extraction examples](../feature_extraction), just change the name of the model you want to use.
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## How do I finetune this model?
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You can finetune any of the pre-trained models just by changing the classifier (the last layer).
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```py
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>>> model = timm.create_model('resnetv2_101x1_bitm', pretrained=True, num_classes=NUM_FINETUNE_CLASSES)
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```
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To finetune on your own dataset, you have to write a training loop or adapt [timm's training
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script](https://github.com/rwightman/pytorch-image-models/blob/master/train.py) to use your dataset.
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## How do I train this model?
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You can follow the [timm recipe scripts](../scripts) for training a new model afresh.
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## Citation
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```BibTeX
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@misc{kolesnikov2020big,
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title={Big Transfer (BiT): General Visual Representation Learning},
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author={Alexander Kolesnikov and Lucas Beyer and Xiaohua Zhai and Joan Puigcerver and Jessica Yung and Sylvain Gelly and Neil Houlsby},
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year={2020},
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eprint={1912.11370},
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archivePrefix={arXiv},
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primaryClass={cs.CV}
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}
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```
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<!--
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Type: model-index
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Collections:
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- Name: Big Transfer
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Paper:
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Title: 'Big Transfer (BiT): General Visual Representation Learning'
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URL: https://paperswithcode.com/paper/large-scale-learning-of-general-visual
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Models:
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- Name: resnetv2_101x1_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 5330896
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Parameters: 44540000
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File Size: 178256468
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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Training Resources: Cloud TPUv3-512
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ID: resnetv2_101x1_bitm
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LR: 0.03
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Epochs: 90
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Layers: 101
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Crop Pct: '1.0'
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Momentum: 0.9
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Batch Size: 4096
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Image Size: '480'
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Weight Decay: 0.0001
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L444
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R101x1-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 82.21%
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Top 5 Accuracy: 96.47%
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- Name: resnetv2_101x3_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 15988688
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Parameters: 387930000
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File Size: 1551830100
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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Training Resources: Cloud TPUv3-512
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ID: resnetv2_101x3_bitm
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LR: 0.03
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Epochs: 90
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Layers: 101
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Crop Pct: '1.0'
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Momentum: 0.9
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Batch Size: 4096
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Image Size: '480'
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Weight Decay: 0.0001
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L451
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R101x3-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 84.38%
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Top 5 Accuracy: 97.37%
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- Name: resnetv2_152x2_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 10659792
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Parameters: 236340000
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File Size: 945476668
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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ID: resnetv2_152x2_bitm
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Crop Pct: '1.0'
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Image Size: '480'
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L458
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R152x2-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 84.4%
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Top 5 Accuracy: 97.43%
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- Name: resnetv2_152x4_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 21317584
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Parameters: 936530000
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File Size: 3746270104
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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Training Resources: Cloud TPUv3-512
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ID: resnetv2_152x4_bitm
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Crop Pct: '1.0'
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Image Size: '480'
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L465
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R152x4-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 84.95%
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Top 5 Accuracy: 97.45%
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- Name: resnetv2_50x1_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 5330896
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Parameters: 25550000
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File Size: 102242668
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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Training Resources: Cloud TPUv3-512
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ID: resnetv2_50x1_bitm
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LR: 0.03
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Epochs: 90
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Layers: 50
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Crop Pct: '1.0'
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Momentum: 0.9
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Batch Size: 4096
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Image Size: '480'
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Weight Decay: 0.0001
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L430
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R50x1-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 80.19%
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Top 5 Accuracy: 95.63%
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- Name: resnetv2_50x3_bitm
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In Collection: Big Transfer
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Metadata:
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FLOPs: 15988688
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Parameters: 217320000
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File Size: 869321580
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Architecture:
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- 1x1 Convolution
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- Bottleneck Residual Block
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- Convolution
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- Global Average Pooling
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- Group Normalization
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- Max Pooling
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- ReLU
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- Residual Block
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- Residual Connection
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- Softmax
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- Weight Standardization
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Tasks:
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- Image Classification
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Training Techniques:
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- Mixup
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- SGD with Momentum
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- Weight Decay
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Training Data:
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- ImageNet
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- JFT-300M
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Training Resources: Cloud TPUv3-512
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ID: resnetv2_50x3_bitm
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LR: 0.03
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Epochs: 90
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Layers: 50
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Crop Pct: '1.0'
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Momentum: 0.9
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Batch Size: 4096
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Image Size: '480'
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Weight Decay: 0.0001
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Interpolation: bilinear
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Code: https://github.com/rwightman/pytorch-image-models/blob/b9843f954b0457af2db4f9dea41a8538f51f5d78/timm/models/resnetv2.py#L437
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Weights: https://storage.googleapis.com/bit_models/BiT-M-R50x3-ILSVRC2012.npz
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Results:
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- Task: Image Classification
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Dataset: ImageNet
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Metrics:
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Top 1 Accuracy: 83.75%
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Top 5 Accuracy: 97.12%
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--> |