mvpa2.misc.surfing.queryengine.SurfaceRingQueryEngine

class mvpa2.misc.surfing.queryengine.SurfaceRingQueryEngine(inner_radius, include_center=False, **kwargs)

Query-engine that maps center nodes to indices of features (nodes) that are inside a ring around each center node.

Methods

query(**kwargs)
query_byid(vertex_id)	Return feature ids of features near a vertex
train(ds)	Train the queryengine
untrain()

Make a new SurfaceRingQueryEngine

Parameters:

inner_radius: float :

size of inner neighborhood to avoid.

include_center: bool :

whether to include center node in the neighborhood. If True, first element of the neighborhood will be the center node, or nearest to center node if center node is not in the dataset. Default: False

surface: surf.Surface :

surface object

radius: float :

size of neighborhood.

distance_metric: str :

‘euclidean’ or ‘dijkstra’ (default).

fa_node_key: str :

Key for feature attribute that contains node indices (default: ‘node_indices’).

Methods

query(**kwargs)
query_byid(vertex_id)	Return feature ids of features near a vertex
train(ds)	Train the queryengine
untrain()

ids

query(**kwargs)

query_byid(vertex_id)

Return feature ids of features near a vertex

Parameters:

vertex_id: int :

Index of vertex (i.e. node) on the surface

Returns:

feature_ids: list of int :

Indices of features in the neighborhood of the vertex indexed by ‘vertex_id’

train(ds)

Train the queryengine

Parameters:

ds: Dataset :

dataset with surface data. It should have a field .fa.node_indices that indicates the node index of each feature.

untrain()