opt_einsum.contract.ContractExpression

class opt_einsum.contract.ContractExpression(contraction, contraction_list, constants_dict, **einsum_kwargs)

Helper class for storing an explicit contraction_list which can then be repeatedly called solely with the array arguments.

__init__(contraction, contraction_list, constants_dict, **einsum_kwargs)

Methods

__call__(*arrays, **kwargs)	Evaluate this expression with a set of arrays.
__delattr__(name, /)	Implement delattr(self, name).
__dir__()	Default dir() implementation.
__eq__(value, /)	Return self==value.
__format__(format_spec, /)	Default object formatter.
__ge__(value, /)	Return self>=value.
__getattribute__(name, /)	Return getattr(self, name).
__getstate__()	Helper for pickle.
__gt__(value, /)	Return self>value.
__hash__()	Return hash(self).
__init__(contraction, contraction_list, ...)
__init_subclass__	This method is called when a class is subclassed.
__le__(value, /)	Return self<=value.
__lt__(value, /)	Return self<value.
__ne__(value, /)	Return self!=value.
__new__(**kwargs)
__reduce__()	Helper for pickle.
__reduce_ex__(protocol, /)	Helper for pickle.
__repr__()	Return repr(self).
__setattr__(name, value, /)	Implement setattr(self, name, value).
__sizeof__()	Size of object in memory, in bytes.
__str__()	Return str(self).
__subclasshook__	Abstract classes can override this to customize issubclass().
_contract(arrays[, out, backend, ...])	The normal, core contraction.
_contract_with_conversion(arrays, out, backend)	Special contraction, i.e., contraction with a different backend but converting to and from that backend.
_get_backend_expression(arrays, backend)
_get_evaluated_constants(backend)	Retrieve or generate the cached list of constant operators (mixed in with None representing non-consts) and the remaining contraction list.
evaluate_constants([backend])	Convert any constant operands to the correct backend form, and perform as many contractions as possible to create a new list of operands, stored in self._evaluated_constants[backend].

Attributes

__annotations__
__dict__
__doc__
__module__
__weakref__	list of weak references to the object