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Sign step and activation functions
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| func activate(bias: Double, bW: Double, x: [Double], w: [Double]) -> Int { | |
| var sum = 0.0 | |
| for i in 0..<x.count { | |
| sum += x[i] * w[i] | |
| } | |
| sum += bias * bW | |
| return step(sum) | |
| } |
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| func sign(z: Double) -> Int { | |
| // Note that 0 is not considered positive or negative | |
| return (z > 0) ? 1 : -1 | |
| } |
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