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Added Softmax to Maths folder (#516)

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Fergus McDonald
2020-10-30 23:50:29 -07:00
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commit 9c9640c1c3
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DIRECTORY.md
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* [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PrimeCheck.js)
* [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ReversePolishNotation.js)
* [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/SieveOfEratosthenes.js)
* [Softmax](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Softmax.js)
* test
* [Abs](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Abs.test.js)
* [Area](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Area.test.js)
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* [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PrimeCheck.test.js)
* [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ReversePolishNotation.test.js)
* [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/SieveOfEratosthenes.test.js)
* [Softmax](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Softmax.test.js)
## Navigation
* [Haversine](https://github.com/TheAlgorithms/Javascript/blob/master/Navigation/Haversine.js)

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Maths/Softmax.js Normal file
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// Wikipedia: https://en.wikipedia.org/wiki/Softmax_function
const Softmax = (inputs) => {
const eulerExpOfAllInputs = inputs.map(input => Math.exp(input))
const sumOfEulerExpOfAllInputs = eulerExpOfAllInputs.reduce((a, b) => a + b)
return inputs.map((input) => {
const eulerExpInputs = Math.exp(input)
return eulerExpInputs / sumOfEulerExpOfAllInputs
})
}
export { Softmax }

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Maths/test/Softmax.test.js Normal file
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import { Softmax } from '../Softmax'
describe('Softmax', () => {
it('should return equal distribution of 1 for equal input values', () => {
expect(Softmax([1, 1])).toEqual([0.5, 0.5])
expect(Softmax([1, 1, 1, 1])).toEqual([0.25, 0.25, 0.25, 0.25])
})
it('should return values which sum to the value of 1', () => {
expect(Softmax([1, 2, 3, 4]).reduce((a, b) => a + b, 0)).toEqual(1)
})
})