Creating a handwritten digit recognition system using deep learning projects with source code can be done in three main steps. First, you must acquire the data that will be used to train your model. This is typically done by downloading datasets from online sources such as MNIST or Kaggle. Once you have acquired the dataset, it needs to be preprocessed so that it is suitable for training with a neural network. Preprocessing includes tasks such as normalization and feature engineering which help improve the accuracy of the model when predicting digits from new input images.
The second step in creating a handwritten digit recognition system using deep learning involves building an appropriate architecture for your neural network based on what type of problem you are trying to solve (i.e., classification or regression). For example, if working with image data then convolutional layers may need to add while fully connected layers would likely work better for tabular data types like text documents or numerical values stored in tables/spreadsheets etc. The number of hidden nodes within each layer should also be carefully considered depending on how complex the task at hand is and how much computational power one has access to during training time since more compute-intensive models usually require larger networks but take longer times per epochs resulting in slower convergence rates overall.
Finally comes implementing this architecture into code form via some programming language like Python followed by setting up hyperparameters related things such as batch size, optimizer choice, learning rate schedule etc .. After doing all these steps we can start fitting our model onto actual given dataset until desired performance metrics achieved.
It's important here not just to focus only on accuracy but also to look out for other factors like overfitting & underfitting along with running experiments with different combinations of hyperparameters to see what works best both terms of speed & quality predictions made by the trained algorithm. In the end, once everything is set up properly all left do test our final output to make sure it's functioning correctly expected results are obtained for each input given!