plotting_utils.py

import matplotlib
matplotlib.use("Agg")
import matplotlib.font_manager as fm
font_path = 'text/batang.ttc'
fontproperties = fm.FontProperties(fname=font_path, size=16)
import matplotlib.pylab as plt
import numpy as np


def save_figure_to_numpy(fig):
    # save it to a numpy array.
    data = np.fromstring(fig.canvas.tostring_rgb(), dtype=np.uint8, sep='')
    data = data.reshape(fig.canvas.get_width_height()[::-1] + (3,))
    return data


def plot_alignment_to_numpy(alignment, info=None):
    fig, ax = plt.subplots(figsize=(6, 4))
    im = ax.imshow(alignment, aspect='auto', origin='lower',
                   interpolation='none')
    fig.colorbar(im, ax=ax)
    xlabel = 'Decoder timestep'
    if info is not None:
        xlabel += '\n\n' + info
    plt.xlabel(xlabel,fontproperties=fontproperties)
    plt.ylabel('Encoder timestep',fontproperties=fontproperties)
    plt.tight_layout()

    fig.canvas.draw()
    data = save_figure_to_numpy(fig)
    plt.close()
    return data


def plot_spectrogram_to_numpy(spectrogram,title=''):

    fig, ax = plt.subplots(figsize=(12, 4))
    im = ax.imshow(spectrogram, aspect="auto", origin="lower",
                   interpolation='none')
    plt.colorbar(im, ax=ax)
    plt.xlabel(title,fontproperties=fontproperties)
    plt.ylabel("Channels",fontproperties=fontproperties)
    fig.canvas.draw()
    data = save_figure_to_numpy(fig)
    plt.close()
    return data


def plot_gate_outputs_to_numpy(gate_targets, gate_outputs):
    fig, ax = plt.subplots(figsize=(12, 4))
    ax.scatter(range(len(gate_targets)), gate_targets, alpha=0.5,
               color='green', marker='+', s=1, label='target')
    ax.scatter(range(len(gate_outputs)), gate_outputs, alpha=0.5,
               color='red', marker='.', s=1, label='predicted')

    plt.xlabel("Frames (Green target, Red predicted)",fontproperties=fontproperties)
    plt.ylabel("Gate State",fontproperties=fontproperties)
    plt.tight_layout()

    fig.canvas.draw()
    data = save_figure_to_numpy(fig)
    plt.close()
    return data