cuquantum.custatevec.compute_expectation_get_workspace_size¶

cuquantum.custatevec.compute_expectation_get_workspace_size(intptr_t handle, int sv_data_type, uint32_t n_index_bits, intptr_t matrix, int matrix_data_type, int layout, uint32_t n_basis_bits, int compute_type) → size_t[source]¶

This function gets the required workspace size for compute_expectation().

Parameters

handle (intptr_t) – the handle to the cuStateVec context.
sv_data_type (int) – Data type of the state vector.
n_index_bits (uint32_t) – the number of index bits of the state vector.
matrix (intptr_t) – host or device pointer to a matrix.
matrix_data_type (int) – data type of matrix.
layout (MatrixLayout) – enumerator specifying the memory layout of matrix.
n_basis_bits (uint32_t) – the number of target bits.
compute_type (ComputeType) – compute_type of matrix multiplication.

Returns

size of the extra workspace.

Return type

size_t