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DEThe softmax activation function is used in machine learning, especially in classification problems, to convert a model's raw output values (also called logits) into probabilities.
It helps the model understand the most likely class by turning those logits into values between 0 and 1, where all the values add up to 1, representing probabilities.
Here’s how it works in simple terms:
- Input Values (Logits): Imagine the model gives several output values (logits), one for each possible class. These values could be any number, positive or negative.
- Exponentiation: The softmax function takes these output values, applies an exponential function to each (which makes them all positive and larger), and then normalizes them.
- Normalization: To convert these into probabilities, it divides each exponentiated value by the sum of all the exponentiated values. This ensures that the sum of the outputs is 1, making them valid probabilities.
For example:
If a model predicts three classes with logits [2.0, 1.0, 0.1], softmax will convert these into probabilities like [0.65, 0.24, 0.11].
The highest probability (0.65) shows the model thinks the first class is the most likely.
In short, softmax assigns probabilities to different classes so the model can decide which class is most likely.
C: 3blue1brown (YT)
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