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Mojo function

selective_scan_fwd_cpu

selective_scan_fwd_cpu[kernel_dtype: DType, DSTATE: Int](batch: Int, dim: Int, seqlen: Int, group_size: Int, delta_softplus: Int8, output: TileTensor[kernel_dtype, address_space=output.address_space, linear_idx_type=output.linear_idx_type, element_size=output.element_size], x: TileTensor[kernel_dtype, address_space=x.address_space, linear_idx_type=x.linear_idx_type, element_size=x.element_size], out_z: TileTensor[kernel_dtype, address_space=out_z.address_space, linear_idx_type=out_z.linear_idx_type, element_size=out_z.element_size], u: TileTensor[kernel_dtype, address_space=u.address_space, linear_idx_type=u.linear_idx_type, element_size=u.element_size], delta: TileTensor[kernel_dtype, address_space=delta.address_space, linear_idx_type=delta.linear_idx_type, element_size=delta.element_size], A: TileTensor[kernel_dtype, address_space=A.address_space, linear_idx_type=A.linear_idx_type, element_size=A.element_size], B: TileTensor[kernel_dtype, address_space=B.address_space, linear_idx_type=B.linear_idx_type, element_size=B.element_size], C: TileTensor[kernel_dtype, address_space=C.address_space, linear_idx_type=C.linear_idx_type, element_size=C.element_size], D: TileTensor[kernel_dtype, address_space=D.address_space, linear_idx_type=D.linear_idx_type, element_size=D.element_size], z: TileTensor[kernel_dtype, address_space=z.address_space, linear_idx_type=z.linear_idx_type, element_size=z.element_size], delta_bias: TileTensor[kernel_dtype, address_space=delta_bias.address_space, linear_idx_type=delta_bias.linear_idx_type, element_size=delta_bias.element_size], output_strides: IndexList[3], x_strides: IndexList[4], out_z_strides: IndexList[3], u_strides: IndexList[3], delta_strides: IndexList[3], A_strides: IndexList[2], B_strides: IndexList[4], C_strides: IndexList[4], D_strides: IndexList[1], z_strides: IndexList[3], delta_bias_strides: IndexList[1], ctx: Optional[DeviceContext] = None)

CPU kernel for selective scan forward pass.