Method sigmoid

cake-core/src/backends/mod.rs:508–510

Sigmoid activation: `1 / (1 + exp(-x))`.

(&self, x: &Tensor)

    /// Sigmoid activation: `1 / (1 + exp(-x))`.
    fn sigmoid(&self, x: &Tensor) -> Result<Tensor> {
        candle_nn::ops::sigmoid(x)
    }

    /// Embedding lookup: select rows from weight matrix by token IDs.
    fn embedding(&self, ids: &Tensor, weight: &Tensor) -> Result<Tensor> {