# Loss Function

## What is Loss Function

A loss function is really basic at its core: It’s a method of figuring out how well your algorithm matches the data. The loss function will provide a higher value if forecasts are completely wrong. It’ll give you a lower number if they’re fairly decent. Your loss function will inform you if you’re making progress when you tweak parts of your algorithm to try to enhance your model.

Model accuracy is an important component of AI/ML governance, and loss functions are connected to it.

## Different kinds of Loss Functions

Many of the loss functions used in machine learning may become complicated and perplexing. However, if you bear in mind the final purpose of all loss functions—measuring how well your algorithm performs on your dataset—you can reduce the complexity to a minimum.

We’ll go through a handful of the most often used loss functions, ranging from simple to sophisticated.

• MSE –  is the backbone of fundamental loss functions(MSE= Mean squared error). It’s simple to comprehend and apply, and it works well in most cases. Take the difference between your predictions and the ground truth, square it, then average it over the whole dataset to get MSE.
• The likelihood function is also a straightforward function that is frequently employed in classification difficulties. The function multiplies the expected probabilities for each input sample. And, while the output isn’t quite human-readable, it’s valuable for model comparison.
• Log loss is a function that is commonly used in classification tasks, and it is one of the most prominent Kaggle competition metrics. It’s merely a standard logarithmic variation of the likelihood function.

This is the same formula as the conventional likelihood function, but with the addition of logarithms. The second half of the function vanishes when the real class is 1, and the first half vanishes when the actual class is 0. We just multiply the log of the probability for the class in this manner.

The good fact regarding the log loss function is that it punishes you harshly if you’re overconfident and incorrect.

## Optimize Loss Function

Loss functions are how your algorithms fit data in the first place, so they’re more than simply a static depiction of how your model is working. In the process of optimizing, or determining the optimum parameters (weights) for your data, most machine learning algorithms employ some form of the loss function.

There are a plethora of different optimizers, just as there are a plethora of different loss functions for various situations. In essence, the loss function and optimizer work together to maximize the algorithm’s fit to your data.

## Model accuracy

Model correctness is a critical component of AI/ML governance, and both loss functions and optimizers are connected to it. The complete process for how an organization regulates access and records activity for models and their outputs is known as AI/ML governance.

Effective governance is the foundation for reducing risk to an organization’s financial line as well as its reputation. ML governance is necessary to reduce corporate risk in the case of an audit, but it encompasses much more than regulatory compliance. Organizations that properly apply all components of ML governance may gain fine-grained control and insight into how models perform in production while also generating operational efficiencies that help them get more out of their AI investments.

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