Machine Learning vs Traditional Programming

Introduction: What is the traditional programming paradigm vs Machine Learning?

With digital becoming a part of everyday life, software development and programming continually keep revolutionizing businesses, especially across advanced intelligence. We are going to overview the differences between Traditional programming and Machine Learning paradigms.

In Traditional programming, we write down the exact steps required to solve the problem.  While with a subset of Artificial Intelligence (AI),  Machine Learning is motivated by human learning behavior; we just show examples and let the machine figure out how to solve the problem by itself. 

Machine Learning vs Traditional programming scheme

The following is a real-life example of how traditional programming and Machine Learning differ. Imagine a hypothetical  insurance company that is striving for the best customer experience in the 21st digital environment, as well as preserving assets and their ROI. So,  the automatic detection of fraudulent claims is a part of their business processes.

Consequently, there are 2 possible scenarios of technology stepping in:

  1. Traditional programming (rule-based approach). In this case, we define the set of rules that will determine whether the claim is fraudulent or genuine, and then a developer translates them into code. This works great when such rules exist and we know about them.
  2. Unfortunately, this is not always the case in real life. We do not always know exactly what rules a program should follow. The insurance agent’s rule which reads: ‘this case looks suspicious: deny the claim’ is really difficult to translate into code, isn’t it? Let alone the image classification problem, where it’s almost impossible to come up with the rules that will allow us to differentiate between cats and dogs. And that’s exactly where Machine Learning comes into play. The main property of Machine Learning algorithms is the ability to find rules using existing examples.

ML vs Traditional programming - with rules

Now you may wonder what the actual algorithm behind training the model or ‘learning’ from examples is. 

Why Neural Networks are key

We will explain this concept using an Artificial Neural Network (ANN) example. ANN is the Machine Learning model inspired by the networks of biological neurons found in our brains. 

ANNs are powerful scalable tools that tackle complex Machine Learning tasks, such as powering up speech recognition services, classifying billions of images, and automating fraud detection, to name just a few.

→A real case of AI-powered fraud detection

ANNs are heavily used today, although they were first introduced back in 1943. Since then,  they have witnessed several rises and winter periods. But now, due to the huge quantity of data available, tremendous increase in computing power, and improved architectures, it looks like ANN is likely to have a solid impact on our lives.

Neural networks scheme

Neural networks consist of layers with each layer consisting of “neurons“. The most interesting thing is that the neurons are just decimal numbers.

The first layer of the neural network is called the input. In fact, this is your data. In the case of fraud detection, these are the features of an insurance claim (value of the asset claimed, the demo characteristics of the claimant, and so on). So in the case of a face recognition problem, the input is the raw pixels in an image.

The last layer of the neural network is the output layer. This is actually a network prediction based on the data you entered. In our example with fraud detection, it’s a verdict:  fraudulent or genuine.

All the layers are interconnected and each connection is associated with a weight. These are also just decimal numbers. Knowing the values of the neurons of the input layer and the weights, we can calculate the values of all the other neurons in the network.

how neural networks works

That is, the values of the neurons of the first hidden layer are calculated based on the values of the neurons of the input layer, and the connection weights between the input and the first hidden layers.

This process is called forward propagation. 

But, how do we know the value of the weights? Basically we don’t. We need to learn them. And, that’s actually when learning takes place. We can utilize the backpropagation training algorithm for this, which was invented back in 1986, but is still used today. 

For each training instance, the backpropagation algorithm first makes a prediction (forward pass) and measures the error.

  1. The algorithm handles one mini-batch at a time (for example, 32 instances each) and it goes through the full training set multiple times. Each pass is called an epoch.
  2. The algorithm uses a loss function that compares the desired output and the output of the network, and returns some measure of the error.

Then it goes through each layer in reverse order and computes the gradient of loss function with respect to every single model parameter. In other words, it measures the error contribution from each connection (reverse pass). Once we have these gradients, we know how to tweak the parameters in order to reduce the error (this is called the Gradient Descent step).

Neural networks: forward pass

Key takeaways 

Having walked through all of the above, here are some conclusions:

  1. We need data to train the Machine Learning algorithm. The more data, the better. According to Peter Norvig’s famous work ‘The Unreasonable Effectiveness of Data’: for complex problems the data matters more than the algorithm itself.
  2. Data is everywhere and it’s constantly being born on people’s edge devices like mobile phones, cameras and microphones as well as social media and transaction histories. 
  3. Training an ML model is computationally expensive.

In a standard ML setup, data is usually collected from one or multiple clients and stored in a central storage.  A Data Scientist has access to the data in the storage for doing ML.

A data scientist wants to train an AI model on the data using a predefined ML algorithm. Once the model is trained, they evaluate it on new or unseen data. If the model’s performance is not satisfactory, a data scientist makes some changes to the algorithm, does hyper-parameter tuning, or adds more data. Then they retrain and re-evaluate the model. The Data Scientist keeps doing these steps until the model reaches an accepted level of efficiency. 

Once the Data Scientist is happy with the model, they deploy it to the devices where the model will be used to make inference on the device data.

→ Why use Machine Learning to Scale Business Intelligence & Predict Data Outcomes

Machine Learning: constraints and limitations

There are some limitations in standard Machine Learning:

  1. It requires data to be centralized on a single machine or server, or in a data center.
  2. As a result, it compromises the privacy of the data owners by exposing the sensitive information, at least to the developer and the centralized machine owner.
  3. Due to privacy concerns, the owners are not always willing to share their sensitive but useful data, which creates data scarcity.
  4. On top of that, training large Machine Learning algorithms on billions of data in a centralized machine or a cluster of machines is computationally very expensive.

Finally

Traditional programming, that is a manually created program with input data producing the output while running on the computer, has been around for quite some time already. 

Machine Learning, an automated process of the algorithms formulating the rules from the data, is a powerful way that yields productive insights suitable for later usage to predict business valuable outcomes.

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