SliceMetadata¶
- class SliceMetadata(slice_errors, raw_num_paulis, num_unique_paulis, num_duplicate_paulis, num_trimmed_paulis, sum_trimmed_coeffs, num_truncated_paulis, num_paulis, sum_paulis, num_qwc_groups)[source]¶
Bases:
object
A container for metadata generated during the backpropagation of a single slice.
Attributes
- slice_errors: list[float]¶
The truncation error incurred for each observable that is being backpropagated.
- raw_num_paulis: list[int]¶
The “raw” number of Pauli terms for each observable that is being backpropagated. This indicates the number of Pauli terms before any simplification or truncation operations.
- num_unique_paulis: list[int] | None¶
The number of unique Pauli terms for each observable. This attribute only tracks those Pauli terms whose coefficients were not already below the trimming threshold at the beginning of the operator simplification procedure.
Note
This value will be
None
ifsimplify=False
during the backpropagation.
- num_duplicate_paulis: list[int] | None¶
The number of duplicate Pauli terms for each observable whose coefficients have been summed up to trim excess memory usage during the operator simplification.
Note
This value will be
None
ifsimplify=False
during the backpropagation.
- num_trimmed_paulis: list[int] | None¶
The number of Pauli terms for each observable that were trimmed during operator simplification because their total coefficient was below the trimming threshold.
Note
This value will be
None
ifsimplify=False
during the backpropagation.
- sum_trimmed_coeffs: list[float] | None¶
The sum of the coefficients for each observable that were trimmed during operator simplification because each individual coefficient was below the trimming threshold.
Warning
This sum is not affected by the value of
p_norm
!Note
This value will be
None
ifsimplify=False
during the backpropagation.
- num_truncated_paulis: list[int]¶
The number of Pauli terms which were truncated from each observable that is being backpropagated.