Tensorflow. js training data in Node js

Question

I am a student and new to the concept of Artificial intelligence using Tensorflow library.I have the below code and I need an interpretation for the part that has === "setosa" ? 1 : 0,

  //tensor of output for training data
  const outputData = tf.tensor2d(
  iris.map((item) => [
  item.species === "setosa" ? 1 : 0,
  item.species === "virginica" ? 1 : 0,
  item.species === "versicolor" ? 1 : 0,
  ])
);

What does this ? 1 : 0 mean here.

It means: if item.species is the same as "setosa" then it is 1 else it is 0. The outcome (1 or 0) will be then placed in your array. — MertDalbudak
– MertDalbudak, Commented Apr 10, 2021 at 1:41

MertDalbudak · Accepted Answer · 2021-04-10 01:55:41Z

1

The ? : operator is called a Conditional (ternary) operator

The conditional (ternary) operator is the only JavaScript operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy. This operator is frequently used as a shortcut for the if statement.

See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator

In your case either 1 or 0 will be the outcome.
Imagine it being like the if - else functionality. If the statement before the question mark ? is not false or undefined the resulting value is 1 if not it's 0.

edited Apr 10, 2021 at 1:55

answered Apr 10, 2021 at 1:49

MertDalbudak

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