Segformer B2 1024x1024 City 160k

🚀 Segformer Model Card

This model card provides details about the Segformer model for image segmentation, including how to load the trained model, its initialization parameters, and the dataset used.

🚀 Quick Start

You can quickly start using the Segformer model by following the steps below. Click the button to open the Colab notebook for inference with the pre - trained model.

📦 Installation

First, install the required libraries:

pip install -U segmentation_models_pytorch albumentations

💻 Usage Examples

Basic Usage

The following code shows how to load a pre - trained Segformer model and perform inference on an image:

import torch
import requests
import numpy as np
import albumentations as A
import segmentation_models_pytorch as smp

from PIL import Image

device = "cuda" if torch.cuda.is_available() else "cpu"

# Load pretrained model and preprocessing function
checkpoint = "smp-hub/segformer-b2-1024x1024-city-160k"
model = smp.from_pretrained(checkpoint).eval().to(device)
preprocessing = A.Compose.from_pretrained(checkpoint)

# Load image
url = "https://huggingface.co/datasets/hf-internal-testing/fixtures_ade20k/resolve/main/ADE_val_00000001.jpg"
image = Image.open(requests.get(url, stream=True).raw)

# Preprocess image
np_image = np.array(image)
normalized_image = preprocessing(image=np_image)["image"]
input_tensor = torch.as_tensor(normalized_image)
input_tensor = input_tensor.permute(2, 0, 1).unsqueeze(0)  # HWC -> BCHW
input_tensor = input_tensor.to(device)

# Perform inference
with torch.no_grad():
    output_mask = model(input_tensor)

# Postprocess mask
mask = torch.nn.functional.interpolate(
    output_mask, size=(image.height, image.width), mode="bilinear", align_corners=False
)
mask = mask.argmax(1).cpu().numpy()  # argmax over predicted classes (channels dim)

🔧 Technical Details

Model init parameters

The following are the initialization parameters for the model:

model_init_params = {
    "encoder_name": "mit_b2",
    "encoder_depth": 5,
    "encoder_weights": None,
    "decoder_segmentation_channels": 768,
    "in_channels": 3,
    "classes": 19,
    "activation": None,
    "aux_params": None
}

Dataset

The model is trained on the Cityscapes dataset.

📚 Documentation

• Library: https://github.com/qubvel/segmentation_models.pytorch
• Docs: https://smp.readthedocs.io/en/latest/

📄 License

The license information can be found at: https://github.com/NVlabs/SegFormer/blob/master/LICENSE

This model has been pushed to the Hub using the PytorchModelHubMixin