dimod.as_samples#

as_samples(samples_like: ~typing.Mapping[~typing.Hashable, float], dtype: ~numpy.dtype[~typing.Any] | None | type[~typing.Any] | ~numpy._typing._dtype_like._SupportsDType[~numpy.dtype[~typing.Any]] | str | tuple[~typing.Any, int] | tuple[~typing.Any, ~typing.SupportsIndex | ~collections.abc.Sequence[~typing.SupportsIndex]] | list[~typing.Any] | ~numpy._typing._dtype_like._DTypeDict | tuple[~typing.Any, ~typing.Any] = None, copy: bool = False, order: ~typing.Literal['K', 'A', 'C', 'F'] = 'C', labels_type: type = <class 'list'>) → Tuple[ndarray, Sequence[Hashable]]

as_samples(samples_like: ~dimod.sampleset.SampleSet, dtype: ~numpy.dtype[~typing.Any] | None | type[~typing.Any] | ~numpy._typing._dtype_like._SupportsDType[~numpy.dtype[~typing.Any]] | str | tuple[~typing.Any, int] | tuple[~typing.Any, ~typing.SupportsIndex | ~collections.abc.Sequence[~typing.SupportsIndex]] | list[~typing.Any] | ~numpy._typing._dtype_like._DTypeDict | tuple[~typing.Any, ~typing.Any] = None, copy: bool = False, order: ~typing.Literal['K', 'A', 'C', 'F'] = 'C', labels_type: type = <class 'list'>) → Tuple[ndarray, List[Hashable]]

Convert a samples_like object to a NumPy array and list of labels.

Parameters:

samples_like – A collection of raw samples. samples_like is an extension of NumPy’s array_like structure. See examples below.
dtype – dtype for the returned samples array. If not provided, it is either derived from samples_like, if that object has a dtype, or set to the smallest dtype that can hold the given values.
copy – If true, then samples_like is guaranteed to be copied, otherwise it is only copied if necessary.
order – Specify the memory layout of the array. See numpy.array().
labels_type – The return type of the variables labels. labels_type should be a Sequence. The labels_type constructor should accept zero arguments, or an iterable as a single argument.

Returns:

A 2-tuple containing the samples as a ndarray and the variables labels, as a labels_type.

Examples

The following examples convert a variety of samples_like objects:

NumPy arrays

>>> import numpy as np
...
>>> dimod.as_samples(np.ones(5, dtype='int8'))
(array([[1, 1, 1, 1, 1]], dtype=int8), [0, 1, 2, 3, 4])
>>> dimod.as_samples(np.zeros((5, 2), dtype='int8'))
(array([[0, 0],
       [0, 0],
       [0, 0],
       [0, 0],
       [0, 0]], dtype=int8), [0, 1])

Lists

>>> dimod.as_samples([-1, +1, -1])
(array([[-1,  1, -1]], dtype=int8), [0, 1, 2])
>>> dimod.as_samples([[-1], [+1], [-1]])
(array([[-1],
       [ 1],
       [-1]], dtype=int8), [0])

Dicts

>>> dimod.as_samples({'a': 0, 'b': 1, 'c': 0}) 
(array([[0, 1, 0]], dtype=int8), ['a', 'b', 'c'])
>>> dimod.as_samples([{'a': -1, 'b': +1}, {'a': 1, 'b': 1}]) 
(array([[-1,  1],
        [ 1,  1]], dtype=int8), ['a', 'b'])

A 2-tuple containing an array_like object and a list of labels

>>> dimod.as_samples(([-1, +1, -1], ['a', 'b', 'c']))
(array([[-1,  1, -1]], dtype=int8), ['a', 'b', 'c'])
>>> dimod.as_samples((np.zeros((5, 2), dtype='int8'), ['in', 'out']))
(array([[0, 0],
       [0, 0],
       [0, 0],
       [0, 0],
       [0, 0]], dtype=int8), ['in', 'out'])

Deprecated since version 0.10.13: Support for a 2-tuple of (dict, list) as a samples-like will be removed in dimod 0.12.0.