apollon.som.plot module

apollon/som/plot.py

Plotting functions for SOMs.

Licensed under the terms of the BSD-3-Clause license. Copyright (C) 2019 Michael Blaß mblass@posteo.net

apollon.som.plot.cluster_by(ax: matplotlib.axes._axes.Axes, som, data: numpy.ndarray, target: numpy.ndarray, **kwargs) → None

Plot bmu colored by traget.

Parameters

  • ax – Axis subplot.

  • som – SOM instance.

  • data – Input data.

  • target – Target labels.

apollon.som.plot.component(ax: matplotlib.axes._axes.Axes, som, comp: int, outline: bool = False, **kwargs) → None

Plot a component plane.

Parameters

  • ax – Axis subplot.

  • som – SOM instance.

  • comp – Component number.

apollon.som.plot.hit_counts(ax: matplotlib.axes._axes.Axes, som, transform: Optional[Callable] = None, **kwargs) → None

Plot the winner histogram.

Each unit is colored according to the number of times it was bmu.

Parameters

  • ax – Axis subplot.

  • som – SOM instance.

  • mode – Choose either ‘linear’, or ‘log’.

apollon.som.plot.label_target(ax: matplotlib.axes._axes.Axes, som, data: numpy.ndarray, target: numpy.ndarray, **kwargs) → None

Add target labels for each bmu.

Parameters

  • ax – Axis subplot.

  • som – SOM instance.

  • data – Input data.

  • target – Target labels.

apollon.som.plot.qerror(ax: matplotlib.axes._axes.Axes, som, **kwargs) → None

Plot quantization error.

apollon.som.plot.umatrix(ax: matplotlib.axes._axes.Axes, som, outline: bool = False, **kwargs) → None

Plot the U-matrix.

Parameters

  • ax – Axis subplot.

  • som – SOM instance.

Note

Figure aspect is set to ‘eqaul’.

apollon.som.plot.wire(ax: matplotlib.axes._axes.Axes, som, unit_size: Union[int, float, numpy.ndarray] = 100.0, line_width: Union[int, float] = 1.0, highlight: Optional[numpy.ndarray] = None, labels: bool = False, **kwargs) → None

Plot the weight vectors of a SOM with two-dimensional feature space.

Neighbourhood relations are indicate by connecting lines.

Parameters

  • ax – The axis subplot.

  • som – SOM instance.

  • unit_size – Size for each unit.

  • line_width – Width of the wire lines.

  • highlight – Index of units to be marked in different color.

  • labels – If True, attach a box with coordinates to each unit.

Returns

vlines, hlines, bgmarker, umarker