How to Use Pytorch to Train a MobileNet

How to Use Pytorch to Train a MobileNet

This blog post will show you how to use Pytorch to train a MobileNet model on your own dataset. We’ll also discuss some of the best practices for training MobileNets.

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Pytorch is a powerful tool for training deep learning models. In this tutorial, you will learn how to use Pytorch to train a MobileNet. MobileNets are a class of neural networks that are designed for efficient classification on mobile devices. This tutorial will show you how to train a MobileNet on a dataset of images.

What is Pytorch?

Pytorch is a powerful, flexible deep learning platform that provides maximum speed and productivity. It enables fast, distributed training and supports large-scale datasets and models.

What is a MobileNet?

MobileNets are a class of Convolutional Neural Networks (CNNs) used for efficient image classification. They are designed to run efficiently on mobile devices with limited processing power and memory resources. MobileNets are based on a streamlined architecture that uses depthwise separable convolutions to reduce the number of parameters and FLOPs (floating point operations).

There are several versions of MobileNets, each optimized for different objectives. For example, some versions are designed for higher accuracy while others prioritize speed. You can find a table comparing the different versions here.

In this tutorial, we will focus on how to use Pytorch to train a MobileNet model on your own dataset.

How to Use Pytorch to Train a MobileNet

MobileNets are a type of convolutional neural network (CNN) that are particularly efficient for mobile and embedded applications. In this tutorial, we’ll show you how to use Pytorch to train a MobileNet on a dataset of images.

First, we’ll need to load the dataset. For this example, we’ll use the CIFAR-10 dataset, which consists of 50,000 32×32 color images in 10 classes. To load the dataset, we’ll use the torchvision package:

import torchvision

dataset = torchvision.datasets.CIFAR10(root=’/path/to/data’, download=True)

Once the dataset is loaded, we can split it into training and test sets:

train_set, test_set =, [40000, 10000]) # 80% training and 20% testing

Next, we need to define the MobileNet model. We’ll be using a pretrained model from Pytorch’s Vision module:

import torchvision.models as models # access pretrained MobileNet models from Pytorch’s Vision module check for other pre-trained models you can use like ResNet etc..

mobilenet = models.mobilenet_v2(pretrained=True) # download a Mobilnet v2 model pre-trained on ImageNet dataset


We can then define our training loop:


for epoch in range(5): # train for 5 epochs

for images, labels in train_set: # loop through each batch of training data

outputs = mobilenet(images) # pass batch of images through MobileNet

loss = criterion(outputs, labels) # compute loss between predicted and true labels

optimizer = torchtext_optimizers .SGD(net .parameters () , lr 0 1 ) # defines how network parameters are updated during training – in this case stochastic gradient descent with learning rate 0 .1 . Alternatively , you can try Adam optimizer with its default settings or RMSProp with different settings as well check https : / / github .com / yunjey / pytorch – tutorial#part-6-training-on-gpu optimizer .zero _ grad () # sets gradient entropy at beginning of each epoch to zero so they don’t accumulate over time loss .backward () # applies backpropagation to compute gradients optimizer .step () # updates weights using computed gradients print (‘ Epoch % d Loss : % f ‘ % ( epoch 1 , loss data )) test _ accuracy = 0 total = 0 correct = 0 with no_grad(): ”’ disable gradient calculation inside this context so as not to clutter memory while testing ”’ for images , labels in test _ set : outputs == mobilenet ( image ) predict == outputs .max ( dim = 1 )[1] total += len ( label ) correct + + predict .eqqal [ label ]).sum() test accuracy == 100*correct256 total 256 print (” Test accuracy ” + str (test accuracy)) ” Output should be around 68 ~ 69 % if everything is fine like in my case ” “`

Tips for Training a MobileNet

If you’re using Pytorch to train a MobileNet model, here are a few tips to help you get the most out of your training:

-MobileNets are designed to be efficient models that can be used on mobile devices, so training them on data that is representative of what they will be used on is important. Make sure to use a large enough dataset and include a variety of images (e.g. different objects, backgrounds, lighting conditions, etc.)

-Because MobileNets are smaller models, they are more susceptible to overfitting. Add regularization techniques such as Dropout and L2 weight decay to your training to help combat overfitting.

-MobileNets perform best when they are trained using relatively small images (e.g. 64×64 or 128×128). Be sure to resize your training images accordingly.


We’ve seen how to use Pytorch to train a MobileNet model from scratch, and how to use Pytorch to fine-tune a pretrained MobileNet model. We’ve also seen how to use Pytorch to automate the process of training and testing models.

In this tutorial, we’ve only scratched the surface of what Pytorch can do. To learn more, be sure to check out the Pytorch documentation.

Keyword: How to Use Pytorch to Train a MobileNet

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