models.cuts
¶
Objects that represent partitions of sets of nodes.
-
class
pyphi.models.cuts.
NullCut
(indices, node_labels=None)¶ The cut that does nothing.
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property
is_null
¶ This is the only cut where
is_null == True
.
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property
indices
¶ Indices of the cut.
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cut_matrix
(n)¶ Return a matrix of zeros.
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to_json
()¶
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property
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class
pyphi.models.cuts.
Cut
(from_nodes, to_nodes, node_labels=None)¶ Represents a unidirectional cut.
-
from_nodes
¶ Connections from this group of nodes to those in
to_nodes
are from_nodes.- Type
tuple[int]
-
to_nodes
¶ Connections to this group of nodes from those in
from_nodes
are from_nodes.- Type
tuple[int]
-
from_nodes
-
to_nodes
-
node_labels
¶
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property
indices
¶ Indices of this cut.
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cut_matrix
(n)¶ Compute the cut matrix for this cut.
The cut matrix is a square matrix which represents connections severed by the cut.
- Parameters
n (int) – The size of the network.
Example
>>> cut = Cut((1,), (2,)) >>> cut.cut_matrix(3) array([[0., 0., 0.], [0., 0., 1.], [0., 0., 0.]])
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to_json
()¶ Return a JSON-serializable representation.
-
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class
pyphi.models.cuts.
KCut
(direction, partition, node_labels=None)¶ A cut that severs all connections between parts of a K-partition.
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property
indices
¶ Indices of this cut.
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cut_matrix
(n)¶ The matrix of connections that are severed by this cut.
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to_json
()¶
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property
-
class
pyphi.models.cuts.
ActualCut
(direction, partition, node_labels=None)¶ Represents an cut for a
Transition
.-
property
indices
¶ Indices of this cut.
-
property
-
class
pyphi.models.cuts.
Part
¶ Represents one part of a
Bipartition
.-
mechanism
¶ The nodes in the mechanism for this part.
- Type
tuple[int]
-
purview
¶ The nodes in the mechanism for this part.
- Type
tuple[int]
Example
When calculating \(\varphi\) of a 3-node subsystem, we partition the system in the following way:
mechanism: A,C B ─── ✕ ─── purview: B A,C
This class represents one term in the above product.
Create new instance of Part(mechanism, purview)
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to_json
()¶ Return a JSON-serializable representation.
-
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class
pyphi.models.cuts.
KPartition
(*parts, node_labels=None)¶ A partition with an arbitrary number of parts.
-
parts
¶
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node_labels
¶
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property
mechanism
¶ tuple[int]: The nodes of the mechanism in the partition.
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property
purview
¶ tuple[int]: The nodes of the purview in the partition.
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normalize
()¶ Normalize the order of parts in the partition.
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to_json
()¶
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classmethod
from_json
(dct)¶
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