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# Tutor profile: Surya R.

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Surya R.
Tutored for two years
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## Questions

### Subject:Machine Learning

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Question:

What is a neural network?

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Surya R.

A neural network is an algorithm that can be used in machine learning, where a computer learns to complete a task by finding patterns in large volumes of data. The neural network is made up of multiple layers of individual nodes, which are areas where data is passed into at each layer. These nodes can be connected to several other nodes: they can be connected to the previous layer and receive data, and be connected to nodes in the next layer and feed further nodes data. Data is first fed into the input layer, and is then passed to the next layer, and so on and so forth depending on the number of layers. This process is called feed-forward, as data is moving through the network in a single direction. When data passes through these layers and each node receives an incoming connection, it will assign a number known as a weight. When data is passed through each node, the node will multiply the weight by the incoming value. If this value is below a certain threshold value, it will not pass the data, but if it is greater than the established threshold value, it will pass this data to the next node and repeat this process. Initially, the weights are randomly established, so its accuracy will be poor. But, through the training process, these weights are automatically adjusted to ensure that the accuracy is increasing. This is by far the best performing machine learning algorithm so far, because of how much data it can handle, and how efficiently it can be trained to solve problems such as image recognition, natural language processing, etc.

### Subject:Geometry

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Question:

What is the area of a circle with a diameter of 14?

Inactive
Surya R.

In the question, we are given the diameter. The unknown in this question is the area, and we know that the formula for the area of a circle is pi*r^2. In order to get the radius of the circle, we simply need to divide the diameter by 2, because the diameter is the distance from one end of the circle to the other. The radius is the distance from the midpoint to any point on the circle, so dividing the diameter by 2 will yield the radius. From here, we can substitute 7 for the radius in the area formula, and find the answer to be 49pi.

### Subject:ACT

TutorMe
Question:

How is the ACT different than the SAT? Which should I take?

Inactive
Surya R.

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