numpy.histogramdd(sample, bins=10, range=None, normed=None, weights=None, density=None)https://docs.scipy.org/doc/numpy/reference/generated/numpy.histogramdd.html
numpy.meshgrid(*xi, **kwargs)https://docs.scipy.org/doc/numpy/reference/generated/numpy.meshgrid.html
matplotlib.pyplot.scatter(x, y, s=None, c=None, marker=None, cmap=None, norm=None, vmin=None, vmax=None, alpha=None, linewidths=None, verts=None, edgecolors=None, *, data=None, **kwargs)https://matplotlib.org/api/_as_gen/matplotlib.pyplot.scatter.html#matplotlib.pyplot.scatter
s：scalar or array_like：shape (n, )
c：color, sequence, or sequence of color
marker：标记样式
norm：亮度数据
numpy.random.randint(low, high=None, size=None, dtype='l')https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.randint.html
numpy.median(a, axis=None, out=None, overwrite_input=False, keepdims=False)https://docs.scipy.org/doc/numpy/reference/generated/numpy.median.html