11. Data Visualization

Bodo supports Matplotlib visualization natively inside JIT functions. This section specifies the supported Matplotlib APIs and classes. In general, these APIs support all arguments except for the restrictions specified in each section.

11.1. Plotting APIs

Currently, Bodo automatically supports the following plotting APIs.

  • matplotlib.pyplot.plot()

  • matplotlib.pyplot.scatter()

  • matplotlib.pyplot.bar()

  • matplotlib.pyplot.contour()

  • matplotlib.pyplot.contourf()

  • matplotlib.pyplot.quiver()

  • matplotlib.pyplot.pie() (autopct must be a constant boolean or omitted)

  • matplotlib.pyplot.fill()

  • matplotlib.pyplot.fill_between()

  • matplotlib.pyplot.step()

  • matplotlib.pyplot.errorbar()

  • matplotlib.pyplot.barbs()

  • matplotlib.pyplot.eventplot()

  • matplotlib.pyplot.hexbin()

  • matplotlib.pyplot.xcorr() (autopct must be a constant boolean or omitted)

  • matplotlib.pyplot.imshow()

  • matplotlib.pyplot.plot()

  • matplotlib.pyplot.scatter()

  • matplotlib.pyplot.bar()

  • matplotlib.axes.Axes.contour()

  • matplotlib.axes.Axes.contourf()

  • matplotlib.axes.Axes.quiver()

  • matplotlib.axes.Axes.pie() (usevlines must be a constant boolean or omitted)

  • matplotlib.axes.Axes.fill()

  • matplotlib.axes.Axes.fill_between()

  • matplotlib.axes.Axes.step()

  • matplotlib.axes.Axes.errorbar()

  • matplotlib.axes.Axes.barbs()

  • matplotlib.axes.Axes.eventplot()

  • matplotlib.axes.Axes.hexbin()

  • matplotlib.axes.Axes.xcorr() (usevlines must be a constant boolean or omitted)

  • matplotlib.axes.Axes.imshow()

These, APIs have the following restrictions:

  • The data being plotted must be Numpy arrays and not Pandas data structures.

  • Use of lists are not currently supported. If you need to plot multiple arrays use a tuple or a 2D Numpy array.

Warning: These APIs gather the entire data onto a single process. If you have a large dataset that does not fit into a single machine’s memory, consider sampling your data before plotting if you have a larger dataset.

11.2. Formatting APIs

In addition to plotting, we also support a variety of formatting APIs to modify your figures.

  • matplotlib.pyplot.gca()

  • matplotlib.pyplot.gcf()

  • matplotlib.pyplot.text()

  • matplotlib.pyplot.subplots() (nrows and ncols must be constant integers)

  • matplotlib.pyplot.suptitle()

  • matplotlib.pyplot.tight_layout()

  • matplotlib.pyplot.savefig()

  • matplotlib.pyplot.draw()

  • matplotlib.pyplot.show() (Output is only displayed on rank 0)

  • matplotlib.figure.Figure.suptitle()

  • matplotlib.figure.Figure.tight_layout()

  • matplotlib.figure.Figure.subplots() (nrows and ncols must be constant integers)

  • matplotlib.figure.Figure.show() (Output is only displayed on rank 0)

  • matplotlib.axes.Axes.annotate()

  • matplotlib.axes.Axes.text()

  • matplotlib.axes.Axes.set_xlabel()

  • matplotlib.axes.Axes.set_ylabel()

  • matplotlib.axes.Axes.set_xscale()

  • matplotlib.axes.Axes.set_yscale()

  • matplotlib.axes.Axes.set_xticklabels()

  • matplotlib.axes.Axes.set_yticklabels()

  • matplotlib.axes.Axes.set_xlim()

  • matplotlib.axes.Axes.set_ylim()

  • matplotlib.axes.Axes.set_xticks()

  • matplotlib.axes.Axes.set_yticks()

  • matplotlib.axes.Axes.set_axis_on()

  • matplotlib.axes.Axes.set_axis_off()

  • matplotlib.axes.Axes.draw()

  • matplotlib.axes.Axes.set_title()

  • matplotlib.axes.Axes.legend()

  • matplotlib.axes.Axes.grid()

In general these APIs support all arguments except for the restrictions specified. In addition, APIs have the following restrictions:

  • Use of lists are not currently supported. If you need to provide a list, please use a tuple instead.

  • Formatting functions execute on all ranks by default. If you need to execute further Matplotlib code on all of your processes, please close any figures you opened inside Bodo.

11.3. Matplotlib Classes

Bodo supports the following Matplotlib classes when used with the previously mentioned APIs:

  • matplotlib.figure.Figure

  • matplotlib.axes.Axes

  • matplotlib.text.Text

  • matplotlib.text.Annotation

  • matplotlib.lines.Line2D

  • matplotlib.collections.PathCollection

  • matplotlib.container.BarContainer

  • matplotlib.contour.QuadContourSet

  • matplotlib.quiver.Quiver

  • matplotlib.patches.Wedge

  • matplotlib.patches.Polygon

  • matplotlib.collections.PolyCollection

  • matplotlib.image.AxesImage

  • matplotlib.container.ErrorbarContainer

  • matplotlib.quiver.Barbs

  • matplotlib.collections.EventCollection

  • matplotlib.collections.LineCollection

11.4. Working with Unsupported APIs

For other visualization functions, you can call them from regular Python and manually gather the data. If the data does not fit a single machine’s memory, you may need to take a sample. The example code below demonstrates gathering a portion of data in Bodo and calling polar (which Bodo doesn’t support yet) in regular Python:

import bodo
import numpy as np
import matplotlib.pyplot as plt

def dist_gather_test(n):
    X = np.arange(n)
    Y = 3 - np.cos(X)
    return bodo.gatherv(X[::10]), bodo.gatherv(Y[::10])  # gather every 10th element

X_Sample, Y_Sample = dist_gather_test(1000)
if bodo.get_rank() == 0:
    plt.polar(X_Sample, Y_Sample)