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Higher accuracy on vision models with EfficientNet-Lite

↗ Quelle (blog.tensorflow.org)
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Posted by Renjie Liu, Software Engineer

In May 2019, Google released a family of image classification models called , and designed for performance on mobile CPU, GPU, and EdgeTPU. EfficientNet-Lite brings the power of EfficientNet to edge devices and comes in five variants, allowing users to choose from the low latency/model size option (EfficientNet-Lite0) to the high accuracy option (EfficientNet-Lite4). The largest variant, integer-only quantized EfficientNet-Lite4, achieves 80.4% ImageNet top-1 accuracy, while still running in real-time (e.g. 30ms/image) on a Pixel 4 CPU. Below is how the quantized EfficientNet-Lite models perform compared to similarly quantized version of some popular image classification models.
Figures: Integer-only quantized models running on Pixel 4 CPU with 4 threads.

Challenges: Quantization and heterogeneous hardware

The unique nature of edge devices raises several challenges.

Quantization: Since many edge devices have limited floating-point support, quantization is widely used. However, it often requires a complicated quantization-aware training procedure or poor post-training quantization model accuracy.

Thankfully, within our toolkit, we leveraged the , we easily quantized the model without losing much accuracy via integer-only post-training quantization (for more information, see * Benchmarked on Pixel 4 CPU with 4 threadsWe also want to share some of our experience about post-training quantization. When we first tried post-training quantization, we found a significant accuracy drop: Top-1 accuracy dropped from 75% to 46% on the ImageNet dataset.
We found that the issue was caused by the quantized output range being too wide. Quantization was essentially doing affine transformation of the floating-point values to fit into the int8 buckets:
That's a sign that we may have lost too much accuracy as it was hard to fit the wide-ranged floating tensor into int8 ranged buckets.
To address the issue, we replaced the , which is a tool that enables you to apply transfer learning on existing TensorFlow models with a user’s input data and export the resulting model to a TensorFlow Lite format.
TensorFlow Lite Model Maker supports multiple model architectures, including MobileNetV2 and all variants of EfficientNet-Lite. Here is an example of how you can build an EfficientNet-Lite0 image classification model with just 5 lines of code:
PYTHON
# Load your custom dataset
data = ImageClassifierDataLoader.from_folder(flower_path)
train_data, test_data = data.split(0.9)

# Customize the pre-trained TensorFlow model
model = image_classifier.create(train_data, model_spec=efficienetnet_lite0_spec)

# Evaluate the model
loss, accuracy = model.evaluate(test_data)

# Export as TensorFlow Lite model.
model.export('image_classifier.tflite', 'image_labels.txt')
Try out the library with the flower classification , you can achieve ~92% accuracy under a few minutes with 5 epochs. Accuracy can be improved if you train with more epochs, more data, or fine-tune the whole model.
Next, let’s build a mobile app with this model. You can start with our to the assets folder. If you want to try out your customized model created with Model Maker, you can replace it in the assets folder.
As shown in the screenshot, the EfficientNet-Lite model runs inference in real-time (>= 30 fps).
). Try out . Learn more about TensorFlow Lite at , and explore more TensorFlow Lite models at
Vollständiger Original-Bericht
Ausführliche Details, Code-Beispiele & Hersteller-Stellungnahme auf blog.tensorflow.org.
↗ Original-Artikel auf blog.tensorflow.org lesen
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