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  7. masked_select

torch.masked_select

function masked_select(input: Tensor, mask: Tensor): Tensor

Returns a 1D tensor containing elements from input where mask is True.

Note: Due to WebGPU limitations, this returns a tensor with shape [inputSize] (the maximum possible size). The actual selected elements are packed at the beginning. Use masked_select_async() to get a tensor with exact shape.

Parameters

inputTensor
The input tensor
maskTensor
The boolean mask tensor (must broadcast to match input shape)

Returns

Tensor– A 1D tensor with selected elements (may have trailing garbage on WebGPU)

Examples

const x = torch.tensor([1, 2, 3, 4]);
const mask = torch.tensor([true, false, true, false]);
torch.masked_select(x, mask);  // [1, 3] (plus trailing elements on WebGPU)

See Also

  • PyTorch torch.masked_select()
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