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)
Bases: object
A container for metadata generated during the backpropagation of a single slice.
Attributes
Parameters
- slice_errors (list[float])
- raw_num_paulis (list[int])
- num_unique_paulis (list[int] | None)
- num_duplicate_paulis (list[int] | None)
- num_trimmed_paulis (list[int] | None)
- sum_trimmed_coeffs (list[float] | None)
- num_truncated_paulis (list[int])
- num_paulis (list[int])
- sum_paulis (int | None)
- num_qwc_groups (int | None)
slice_errors
Type: list[float]
The truncation error incurred for each observable that is being backpropagated.
raw_num_paulis
Type: 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
Type: 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.
This value will be None if simplify=False during the backpropagation.
num_duplicate_paulis
Type: 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.
This value will be None if simplify=False during the backpropagation.
num_trimmed_paulis
Type: 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.
This value will be None if simplify=False during the backpropagation.
sum_trimmed_coeffs
Type: 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.
This sum is not affected by the value of p_norm!
This value will be None if simplify=False during the backpropagation.
num_truncated_paulis
Type: list[int]
The number of Pauli terms which were truncated from each observable that is being backpropagated.
num_paulis
Type: list[int]
The number of Pauli terms for each observable that is being backpropagated.
sum_paulis
Type: int | None
The number of Pauli terms across all observables. This value is None if it is not bounded during the backpropagation.
This value can differ from sum(num_paulis) because identical Pauli terms will not be counted multiple times.
num_qwc_groups
Type: int | None
The number of qubit-wise commuting groups of Pauli terms across all observables. This value is None if it is not bounded during the backpropagation.