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use crate::{Graph, PaddingMode, Shape, Tensor, ns_number_array_from_slice};
use objc2::{msg_send, rc::Retained};
use objc2_foundation::NSString;
impl Graph {
/// Pads `tensor` according to `padding_mode`.
///
/// # Arguments
///
/// * `tensor` – Input tensor.
/// * `padding_mode` – Padding strategy (constant, reflection, etc.).
/// * `left_padding` – Padding sizes before each dimension (`rank` elements).
/// * `right_padding` – Padding sizes after each dimension (`rank` elements).
/// * `constant_value` – Value used when `padding_mode` is constant.
/// * `name` – Optional debug label.
///
/// # Returns
///
/// A padded [`Tensor`].
pub fn pad(
&self,
tensor: &Tensor,
padding_mode: PaddingMode,
left_padding: &[i64],
right_padding: &[i64],
constant_value: f64,
name: Option<&str>,
) -> Retained<Tensor> {
unsafe {
msg_send![
self,
padTensor: tensor,
withPaddingMode: padding_mode,
leftPadding: &*ns_number_array_from_slice(left_padding),
rightPadding: &*ns_number_array_from_slice(right_padding),
constantValue: constant_value,
name: name.map(NSString::from_str).as_deref(),
]
}
}
/// Computes the gradient for a padding operation.
///
/// # Arguments
///
/// * `incoming_gradient_tensor` – Gradient flowing from subsequent ops (`dL/dP`).
/// * `source_tensor` – Original unpadded tensor from the forward pass.
/// * `padding_mode` – Padding strategy used in the forward op.
/// * `left_padding` – Padding sizes before each dimension.
/// * `right_padding` – Padding sizes after each dimension.
/// * `name` – Optional debug label.
///
/// # Returns
///
/// A [`Tensor`] containing the gradient with respect to the unpadded input.
pub fn pad_gradient(
&self,
incoming_gradient_tensor: &Tensor,
source_tensor: &Tensor,
padding_mode: PaddingMode,
left_padding: &[i64],
right_padding: &[i64],
name: Option<&str>,
) -> Retained<Tensor> {
unsafe {
msg_send![
self,
padGradientWithIncomingGradientTensor: incoming_gradient_tensor,
sourceTensor: source_tensor,
paddingMode: padding_mode,
leftPadding: &*ns_number_array_from_slice(left_padding),
rightPadding: &*ns_number_array_from_slice(right_padding),
name: name.map(NSString::from_str).as_deref(),
]
}
}
}