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CNN for Multi-Digit Classification

This project explores how Convolutional Neural Networks (CNNs) can be used to effectively identify a series of digits from real-world images that are obtained from “The Street View House Numbers (SVHN) Dataset”. CNNs have evolved dramatically every year since the inception of the ImageNet Challenge in 2010.

Problem Statement

I am attempting to predict a series of numbers given an image of house numbers from the SVHN dataset. An important thing to take note is that instead of the standard identification of numbers, as with the MNIST dataset, I now need to correctly detect the numbers and the sequence of numbers.

Programming Language

I used Python and Tensorflow to build the model. This implementation also uses TensorBoard extensively for visualizations.

Problems running Tensorflow? Use TFAMI.

I recommend starting a GPU instance using Amazon's AWS. I have created an image and replicated it across all regions. You can easily run this set of code on the GPU instance within a few minutes. Simply search for TFAMI under community AMIs when you are launching your instance. More information on the specific IDs can be obtained from the following Github repository.

How to use this code base

  1. Create the relevant folders with the commands
    • mkdir log_trial_1
    • mkdir log_trial_2
  2. You can load the data and pre-process all the images with one single command python
  3. Load the first model using the command python
    • The output should resemble something similar to this output.
  4. You can view Tensorboard's visualizations using the command tensorboard --logdir=log_trial_1
  5. Load the second model using the commmand python
    • The output should resemble something similar to this output.
  6. You can view Tensorboard's visualizations using the command tensorboard --logdir=log_trial_2
    • You may encounter an issue whereby it says Port is in use: 6006 if you run tensorboard twice on different trials.
    • Simply run the command lsof -i:6006 or whatever the port number is.
    • Then run the command kill -9 <PID> where the PID is the number you can find when you run the command above.
    • Simply run the command to launch Tensorboard again tensorboard --logdir=log_trial_2

Detailed Report

To guide you through, I have made a detailed report. You can refer to the report here.

Academic Journals and Resources

  1. Multi-digit recognition
  2. The Street View House Numbers (SVHN) Dataset


This is an open source project governed by the license in this repository.


Multi-digit prediction from Google Street's images using deep CNN with TensorFlow, OpenCV and Python.





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