---
library_name: pytorch
tags:
- pytorch
- image-classification
- flowers
- computer-vision
pipeline_tag: image-classification
language:
- en
---

# 🌸 102-Flower Image Classifier — EfficientNet-B0

A PyTorch EfficientNet-B0 image classification model trained to recognize **102 flower categories** from the Oxford 102 Category Flower Dataset.

## Model Performance

| Metric                   | Result          |
| ------------------------ | --------------- |
| Architecture             | EfficientNet-B0 |
| Number of classes        | 102             |
| Input size               | 224 × 224       |
| Best validation accuracy | **94.38%**      |
| Training epochs          | 3               |
| Optimizer                | AdamW           |
| Learning rate            | 0.001           |

The model was trained using transfer learning with an ImageNet-pretrained EfficientNet-B0 backbone.

## Dataset

This model was trained using the **Oxford 102 Category Flower Dataset**, created by **Maria-Elena Nilsback and Andrew Zisserman**.

The dataset contains 102 flower categories with variations in scale, pose, lighting, and appearance.

Official dataset page:

https://www.robots.ox.ac.uk/~vgg/data/flowers/102/

Please review the original dataset documentation and terms before using or redistributing dataset-derived material.

## Files

* `checkpoint.pth` — trained PyTorch checkpoint
* `model_config.json` — model architecture information
* `training_config.json` — training configuration
* `class_config.json` — exact class/index mappings
* `labels.txt` — flower labels
* `requirements.txt` — Python dependencies

## Checkpoint Contents

The `checkpoint.pth` file contains:

* `epoch`
* `model_state_dict`
* `optimizer_state_dict`
* `class_to_idx`

## Use the Model

Install the dependencies:

```bash
pip install torch torchvision pillow
```

Load the model:

```python
import json
import torch
import torch.nn as nn
from torchvision import models, transforms
from PIL import Image

checkpoint = torch.load(
    "checkpoint.pth",
    map_location="cpu",
    weights_only=False
)

model = models.efficientnet_b0(weights=None)

model.classifier[1] = nn.Linear(
    model.classifier[1].in_features,
    102
)

model.load_state_dict(
    checkpoint["model_state_dict"]
)

model.eval()

with open(
    "class_config.json",
    "r",
    encoding="utf-8"
) as f:
    class_config = json.load(f)

idx_to_class = {
    int(k): v
    for k, v in class_config["idx_to_class"].items()
}

transform = transforms.Compose([
    transforms.Resize(256),
    transforms.CenterCrop(224),
    transforms.ToTensor(),
    transforms.Normalize(
        [0.485, 0.456, 0.406],
        [0.229, 0.224, 0.225]
    )
])

image = Image.open(
    "flower.jpg"
).convert("RGB")

x = transform(
    image
).unsqueeze(0)

with torch.inference_mode():
    probabilities = torch.softmax(
        model(x),
        dim=1
    )

    confidence, prediction = probabilities.max(
        dim=1
    )

idx = prediction.item()

print(
    "Prediction:",
    idx_to_class[idx]
)

print(
    "Confidence:",
    f"{confidence.item() * 100:.2f}%"
)
```

## Top-5 Predictions

You can also get the five most likely flower categories:

```python
with torch.inference_mode():
    probabilities = torch.softmax(
        model(x),
        dim=1
    )

    values, indices = torch.topk(
        probabilities,
        k=5
    )

for probability, index in zip(
    values[0],
    indices[0]
):
    flower = idx_to_class[index.item()]
    confidence = probability.item() * 100

    print(
        f"{flower}: {confidence:.2f}%"
    )
```

## Training Configuration

The model was trained using transfer learning.

* Architecture: EfficientNet-B0
* Classes: 102
* Image size: 224 × 224
* Batch size: 32
* Epochs: 3
* Optimizer: AdamW
* Learning rate: 0.001
* Loss: CrossEntropyLoss
* Scheduler: StepLR
* Mixed precision: CUDA when available

### Training Augmentation

* Random resized crop
* Random horizontal flip
* Color jitter
* ImageNet normalization

### Validation Preprocessing

* Resize to 256
* Center crop to 224
* ImageNet normalization

## Evaluation

The best validation accuracy achieved during training was:

**94.38%**

This result corresponds to the validation split used during training.

Performance may vary on images that differ substantially from the training data.

## Interactive Demo

An interactive Gradio application can be deployed using this model so that users can upload flower images directly through a web browser.

The demo can provide:

* Image upload
* Flower prediction
* Confidence score
* Top-5 predictions

## Limitations

This model is designed to classify images into the 102 flower categories represented in the training dataset.

Predictions may be less reliable when:

* The image does not contain a supported flower category.
* The flower is heavily obscured.
* The image is blurry or poorly illuminated.
* Multiple flowers appear in the image.
* The image differs substantially from the training distribution.

This model should be considered an image-classification research/demo model and not a definitive botanical identification system.

## Citation

If you use this model or the underlying dataset, please provide attribution to the original dataset authors.

**Maria-Elena Nilsback and Andrew Zisserman**

*"Automated Flower Classification over a Large Number of Classes."*

Proceedings of the Indian Conference on Computer Vision, Graphics and Image Processing (ICVGIP), 2008.

## Dataset Reference

Oxford 102 Category Flower Dataset:

https://www.robots.ox.ac.uk/~vgg/data/flowers/102/

## Author

**Naila Rais**

Hugging Face:

`nailarais1`

Model:

`nailarais1/image-classifier-efficientnet`

Architecture:

**EfficientNet-B0**

Best validation accuracy:

**94.38%**