The concept of a neural network does not need any additional explanation. Everybody already knows about it, mainly due to the rising popularity of AI. Now, to understand neural networks in-depth, you need to comprehend two topics, epochs and batch.
So, read on to learn more about these two and their differences.
What is Epoch?
Epoch is a hyperparameter that represents the number of times a learning algorithm will work for an entire training dataset. Now, one epoch means every training dataset had the chance to update its internal parameters. Moreover, one epoch contains multiple batches.
Traditionally, the number of epochs is large and can be in thousands. Therefore, it offers ample opportunity for a learning algorithm to run till any error in a model is sufficiently managed.
What is Batch?
It is also a hyperparameter that signifies the number of samples to go through before updating any internal model parameter. Usually, a data set is segregated into different batches for easier and faster calculations.
A batch is a for-loop repeating over one or more samples and making predictions. The batch predictions are then compared to the expected output results, and the error is calculated. This error is used to update the algorithm and improve the model.
A training dataset can be divided into multiple batches. Generally, batch sizes include samples in numbers like 32, 64, and 128 samples.
Difference between Epochs and Batch
Here are some major differences between epochs and batches –
- Batch size runs through the sample before they are updated. In contrast, epoch updates these internal parameters.
- Batch is a part of epoch and not vice versa. So, one epoch contains multiple batches, and batches contain the data sets.
- The size of one batch should be equal to or more than one but lower than or the same as the number of samples in a training data set. Whereas, for epochs, it will depend on the number of the batch size it runs.
Finally, let’s show you the difference with the help of an example.
Let’s say you got a 200-sample dataset. You have chosen a dataset with 1,000 epochs and a batch size of 5.
So, now this dataset will have 40 batches, which have five samples each. This signifies that one epoch here will have 40 batches, or in other words, 40 updates will be made to the model.
Moreover, with 1,000 epochs, this model will go through the total dataset 1,000 times. It means there will be 40,000 batches in this entire process of training.
With these fundamentals out of the way, let’s focus on an associated concept that shares a pivotal relationship with epochs and batch size.
Stochastic Gradient Descent
So, what is Stochastic Gradient Descent? It is a type of learning algorithm which consists of several hyperparameters. To elaborate a little bit further, it is an iterative learning algorithm that uses a training dataset for updating a Neural Network model.
In other words, SGD, or Stochastic Gradient Descent is an optimisation algorithm that finds usage in the training of machine learning algorithms. These are mainly used in artificial neural networks, which is a crucial part of deep learning.
This algorithm’s job is to find out internal model parameter sets that extend better performance compared to a standard quantity like mean squared error or logarithmic loss.
Now, optimization is a sub-type of a searching method, and you can consider this search as learning. The calculation of an error gradient denotes the moving downwards along that slope to some nominal level of error.
Each step contains -
- Utilising a model with the present set of inner parameters to develop estimations on some samples.
- Comparing the calculated estimates against the actual expected outcomes.
- Computing the error and using that error to update the internal parameters of the model.
Summary
Knowing about the number of epochs and batch size allows us to assess which NVidia GPU is appropriate for our neural network or deep learning model. That is why data engineers or AI engineers need to know about these two hyperparameters. Now to run such advanced programs, you can use the cloud GPU services from E2E Networks.
Reference Links
https://machinelearningmastery.com/difference-between-a-batch-and-an-epoch/
https://www.kaggle.com/general/276990
https://towardsdatascience.com/epoch-vs-iterations-vs-batch-size-4dfb9c7ce9c9