Python matplotlib.pyplot.colorbar() Examples

def visualize_sampling(self,permutations):
        max_length = len(permutations[0])
        grid = np.zeros([max_length,max_length]) # initialize heatmap grid to 0
        transposed_permutations = np.transpose(permutations)
        for t, cities_t in enumerate(transposed_permutations): # step t, cities chosen at step t
            city_indices, counts = np.unique(cities_t,return_counts=True,axis=0)
            for u,v in zip(city_indices, counts):
                grid[t][u]+=v # update grid with counts from the batch of permutations
        # plot heatmap
        fig = plt.figure()
        rcParams.update({'font.size': 22})
        ax = fig.add_subplot(1,1,1)
        ax.set_aspect('equal')
        plt.imshow(grid, interpolation='nearest', cmap='gray')
        plt.colorbar()
        plt.title('Sampled permutations')
        plt.ylabel('Time t')
        plt.xlabel('City i')
        plt.show()

    # Heatmap of attention (x=cities; y=steps) 

def visualize_sampling(self, permutations):
        max_length = len(permutations[0])
        grid = np.zeros([max_length,max_length]) # initialize heatmap grid to 0

        transposed_permutations = np.transpose(permutations)
        for t, cities_t in enumerate(transposed_permutations): # step t, cities chosen at step t
            city_indices, counts = np.unique(cities_t,return_counts=True,axis=0)
            for u,v in zip(city_indices, counts):
                grid[t][u]+=v # update grid with counts from the batch of permutations

        # plot heatmap
        fig = plt.figure()
        rcParams.update({'font.size': 22})
        ax = fig.add_subplot(1,1,1)
        ax.set_aspect('equal')
        plt.imshow(grid, interpolation='nearest', cmap='gray')
        plt.colorbar()
        plt.title('Sampled permutations')
        plt.ylabel('Time t')
        plt.xlabel('City i')
        plt.show() 

def plot_attention(sentences, attentions, labels, **kwargs):
    fig, ax = plt.subplots(**kwargs)
    im = ax.imshow(attentions, interpolation='nearest',
                   vmin=attentions.min(), vmax=attentions.max())
    plt.colorbar(im, shrink=0.5, ticks=[0, 1])
    plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
             rotation_mode="anchor")
    ax.set_yticks(range(len(labels)))
    ax.set_yticklabels(labels, fontproperties=getChineseFont())
    # Loop over data dimensions and create text annotations.
    for i in range(attentions.shape[0]):
        for j in range(attentions.shape[1]):
            text = ax.text(j, i, sentences[i][j],
                           ha="center", va="center", color="b", size=10,
                           fontproperties=getChineseFont())

    ax.set_title("Attention Visual")
    fig.tight_layout()
    plt.show() 

def generate_png_chess_dp_vertex(self):
    """Produces pictures of the dominant product vertex a chessboard convention"""
    import matplotlib.pylab as plt
    plt.ioff()
    dab2v = self.get_dp_vertex_doubly_sparse()
    for i, ab in enumerate(dab2v): 
        fname = "chess-v-{:06d}.png".format(i)
        print('Matrix No.#{}, Size: {}, Type: {}'.format(i+1, ab.shape, type(ab)), fname)
        if type(ab) != 'numpy.ndarray': ab = ab.toarray()
        fig = plt.figure()
        ax = fig.add_subplot(1,1,1)
        ax.set_aspect('equal')
        plt.imshow(ab, interpolation='nearest', cmap=plt.cm.ocean)
        plt.colorbar()
        plt.savefig(fname)
        plt.close(fig) 

def test_interpolate_grid_const_nn(self, sphere3_msh):
        data = sphere3_msh.elm.tag1
        f = mesh_io.ElementData(data, mesh=sphere3_msh)
        n = (200, 10, 1)
        affine = np.array([[1, 0, 0, -100.5],
                           [0, 1, 0, -5],
                           [0, 0, 1, 0],
                           [0, 0, 0, 1]], dtype=float)
        interp = f.interpolate_to_grid(n, affine, method='assign')
        '''
        import matplotlib.pyplot as plt
        plt.imshow(np.squeeze(interp))
        plt.colorbar()
        plt.show()
        assert False
        '''
        assert np.isclose(interp[100, 5, 0], 3)
        assert np.isclose(interp[187, 5, 0], 4)
        assert np.isclose(interp[193, 5, 0], 5)
        assert np.isclose(interp[198, 5, 0], 0) 

def test_interpolate_grid_rotate_nn(self, sphere3_msh):
        data = np.zeros(sphere3_msh.elm.nr)
        b = sphere3_msh.elements_baricenters().value
        f = mesh_io.ElementData(data, mesh=sphere3_msh)
        # Assign quadrant numbers
        f.value[(b[:, 0] > 0) * (b[:, 1] > 0)] = 1.
        f.value[(b[:, 0] < 0) * (b[:, 1] > 0)] = 2.
        f.value[(b[:, 0] < 0) * (b[:, 1] < 0)] = 3.
        f.value[(b[:, 0] > 0) * (b[:, 1] < 0)] = 4.
        n = (200, 200, 1)
        affine = np.array([[np.cos(np.pi/4.), np.sin(np.pi/4.), 0, -141],
                           [-np.sin(np.pi/4.), np.cos(np.pi/4.), 0, 0],
                           [0, 0, 1, .5],
                           [0, 0, 0, 1]], dtype=float)
        interp = f.interpolate_to_grid(n, affine, method='assign')
        '''
        import matplotlib.pyplot as plt
        plt.imshow(np.squeeze(interp))
        plt.colorbar()
        plt.show()
        '''
        assert np.isclose(interp[190, 100, 0], 4)
        assert np.isclose(interp[100, 190, 0], 1)
        assert np.isclose(interp[10, 100, 0], 2)
        assert np.isclose(interp[100, 10, 0], 3) 

def test_interpolate_grid_rotate_nodedata(self, sphere3_msh):
        data = np.zeros(sphere3_msh.nodes.nr)
        b = sphere3_msh.nodes.node_coord.copy()
        f = mesh_io.NodeData(data, mesh=sphere3_msh)
        # Assign quadrant numbers
        f.value[(b[:, 0] >= 0) * (b[:, 1] >= 0)] = 1.
        f.value[(b[:, 0] <= 0) * (b[:, 1] >= 0)] = 2.
        f.value[(b[:, 0] <= 0) * (b[:, 1] <= 0)] = 3.
        f.value[(b[:, 0] >= 0) * (b[:, 1] <= 0)] = 4.
        n = (200, 200, 1)
        affine = np.array([[np.cos(np.pi/4.), np.sin(np.pi/4.), 0, -141],
                           [-np.sin(np.pi/4.), np.cos(np.pi/4.), 0, 0],
                           [0, 0, 1, .5],
                           [0, 0, 0, 1]], dtype=float)
        interp = f.interpolate_to_grid(n, affine)
        '''
        import matplotlib.pyplot as plt
        plt.imshow(np.squeeze(interp), interpolation='nearest')
        plt.colorbar()
        plt.show()
        '''
        assert np.isclose(interp[190, 100, 0], 4)
        assert np.isclose(interp[100, 190, 0], 1)
        assert np.isclose(interp[10, 100, 0], 2)
        assert np.isclose(interp[100, 10, 0], 3) 

def test_interpolate_grid_elmdata_linear(self, sphere3_msh):
        data = sphere3_msh.elements_baricenters().value[:, 0]
        f = mesh_io.ElementData(data, mesh=sphere3_msh)
        n = (130, 130, 1)
        affine = np.array([[1, 0, 0, -65],
                           [0, 1, 0, -65],
                           [0, 0, 1, 0],
                           [0, 0, 0, 1]], dtype=float)
        X, _ = np.meshgrid(np.arange(130), np.arange(130), indexing='ij')
        interp = f.interpolate_to_grid(n, affine, method='linear', continuous=True)
        '''
        import matplotlib.pyplot as plt
        plt.figure()
        plt.imshow(np.squeeze(interp))
        plt.colorbar()
        plt.show()
        '''
        assert np.allclose(interp[:, :, 0], X - 64.5, atol=1) 

def test_interpolate_grid_elmdata_dicontinuous(self, sphere3_msh):
        data = sphere3_msh.elm.tag1
        f = mesh_io.ElementData(data, mesh=sphere3_msh)
        n = (200, 130, 1)
        affine = np.array([[1, 0, 0, -100.1],
                           [0,-1, 0, 65.1],
                           [0, 0, 1, 0],
                           [0, 0, 0, 1]], dtype=float)
        interp = f.interpolate_to_grid(n, affine, method='linear', continuous=False)
        '''
        import matplotlib.pyplot as plt
        plt.figure()
        plt.imshow(np.squeeze(interp))
        plt.colorbar()
        plt.show()
        '''
        assert np.allclose(interp[6:10, 65, 0], 5, atol=1e-1)
        assert np.allclose(interp[11:15, 65, 0], 4, atol=1e-1)
        assert np.allclose(interp[16:100, 65, 0], 3, atol=1e-1) 

def plotNNFilter(units, figure_id, interp='bilinear', colormap=cm.jet, colormap_lim=None):
    plt.ion()
    filters = units.shape[2]
    n_columns = round(math.sqrt(filters))
    n_rows = math.ceil(filters / n_columns) + 1
    fig = plt.figure(figure_id, figsize=(n_rows*3,n_columns*3))
    fig.clf()

    for i in range(filters):
        ax1 = plt.subplot(n_rows, n_columns, i+1)
        plt.imshow(units[:,:,i].T, interpolation=interp, cmap=colormap)
        plt.axis('on')
        ax1.set_xticklabels([])
        ax1.set_yticklabels([])
        plt.colorbar()
        if colormap_lim:
            plt.clim(colormap_lim[0],colormap_lim[1])

    plt.subplots_adjust(wspace=0, hspace=0)
    plt.tight_layout()

# Epochs 

def plotNNFilter(units, figure_id, interp='bilinear', colormap=cm.jet, colormap_lim=None):
    plt.ion()
    filters = units.shape[2]
    n_columns = round(math.sqrt(filters))
    n_rows = math.ceil(filters / n_columns) + 1
    fig = plt.figure(figure_id, figsize=(n_rows*3,n_columns*3))
    fig.clf()

    for i in range(filters):
        ax1 = plt.subplot(n_rows, n_columns, i+1)
        plt.imshow(units[:,:,i].T, interpolation=interp, cmap=colormap)
        plt.axis('on')
        ax1.set_xticklabels([])
        ax1.set_yticklabels([])
        plt.colorbar()
        if colormap_lim:
            plt.clim(colormap_lim[0],colormap_lim[1])

    plt.subplots_adjust(wspace=0, hspace=0)
    plt.tight_layout()

# Load options 

def plotNNFilter(units, figure_id, interp='bilinear', colormap=cm.jet, colormap_lim=None, title=''):
    plt.ion()
    filters = units.shape[2]
    n_columns = round(math.sqrt(filters))
    n_rows = math.ceil(filters / n_columns) + 1
    fig = plt.figure(figure_id, figsize=(n_rows*3,n_columns*3))
    fig.clf()

    for i in range(filters):
        ax1 = plt.subplot(n_rows, n_columns, i+1)
        plt.imshow(units[:,:,i].T, interpolation=interp, cmap=colormap)
        plt.axis('on')
        ax1.set_xticklabels([])
        ax1.set_yticklabels([])
        plt.colorbar()
        if colormap_lim:
            plt.clim(colormap_lim[0],colormap_lim[1])

    plt.subplots_adjust(wspace=0, hspace=0)
    plt.tight_layout()
    plt.suptitle(title) 

def plotNNFilterOverlay(input_im, units, figure_id, interp='bilinear',
                        colormap=cm.jet, colormap_lim=None, title='', alpha=0.8):
    plt.ion()
    filters = units.shape[2]
    fig = plt.figure(figure_id, figsize=(5,5))
    fig.clf()

    for i in range(filters):
        plt.imshow(input_im[:,:,0], interpolation=interp, cmap='gray')
        plt.imshow(units[:,:,i], interpolation=interp, cmap=colormap, alpha=alpha)
        plt.axis('off')
        plt.colorbar()
        plt.title(title, fontsize='small')
        if colormap_lim:
            plt.clim(colormap_lim[0],colormap_lim[1])

    plt.subplots_adjust(wspace=0, hspace=0)
    plt.tight_layout()

    # plt.savefig('{}/{}.png'.format(dir_name,time.time()))




## Load options 

def imshow(data, which, levels):
    """
        Display order book data as an image, where order book data is either of
        `df_price` or `df_volume` returned by `load_hdf5` or `load_postgres`.
    """

    if which == 'prices':
        idx = ['askprc.' + str(i) for i in range(levels, 0, -1)]
        idx.extend(['bidprc.' + str(i) for i in range(1, levels + 1, 1)])
    elif which == 'volumes':
        idx = ['askvol.' + str(i) for i in range(levels, 0, -1)]
        idx.extend(['bidvol.' + str(i) for i in range(1, levels + 1, 1)])
    plt.imshow(data.loc[:, idx].T, interpolation='nearest', aspect='auto')
    plt.yticks(range(0, levels * 2, 1), idx)
    plt.colorbar()
    plt.tight_layout()
    plt.show() 

def plot_DOY(dates, y, mpl_cmap):
    """ Create a DOY plot

    Args:
        dates (iterable): sequence of datetime
        y (np.ndarray): variable to plot
        mpl_cmap (colormap): matplotlib colormap
    """
    doy = np.array([d.timetuple().tm_yday for d in dates])
    year = np.array([d.year for d in dates])

    sp = plt.scatter(doy, y, c=year, cmap=mpl_cmap,
                     marker='o', edgecolors='none', s=35)
    plt.colorbar(sp)

    months = mpl.dates.MonthLocator()  # every month
    months_fmrt = mpl.dates.DateFormatter('%b')

    plt.tick_params(axis='x', which='minor', direction='in', pad=-10)
    plt.axes().xaxis.set_minor_locator(months)
    plt.axes().xaxis.set_minor_formatter(months_fmrt)

    plt.xlim(1, 366)
    plt.xlabel('Day of Year') 

def plot_VAL(dates, y, mpl_cmap, reps=2):
    """ Create a "Valerie Pasquarella" plot (repeated DOY plot)

    Args:
        dates (iterable): sequence of datetime
        y (np.ndarray): variable to plot
        mpl_cmap (colormap): matplotlib colormap
        reps (int, optional): number of additional repetitions
    """
    doy = np.array([d.timetuple().tm_yday for d in dates])
    year = np.array([d.year for d in dates])

    # Replicate `reps` times
    _doy = doy.copy()
    for r in range(1, reps + 1):
        _doy = np.concatenate((_doy, doy + r * 366))
    _year = np.tile(year, reps + 1)
    _y = np.tile(y, reps + 1)

    sp = plt.scatter(_doy, _y, c=_year, cmap=mpl_cmap,
                     marker='o', edgecolors='none', s=35)
    plt.colorbar(sp)
    plt.xlabel('Day of Year') 

def plot_confusion(title, true_labels, predicted_labels, normalized=True):
    labels = list(set(true_labels) | set(predicted_labels))

    if normalized:
        cm = confusion_matrix(true_labels, predicted_labels, labels=labels)
        cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis]
    else:
        cm = confusion_matrix(true_labels, predicted_labels, labels=labels)

    fig, ax = plt.subplots(figsize=(10, 10))
    ax.imshow(cm, interpolation='nearest', cmap=plt.cm.Blues)
    ax.set_title(title)
    # plt.colorbar()
    tick_marks = np.arange(len(labels))
    ax.set_xticks(tick_marks)
    ax.set_xticklabels(labels, rotation=90)
    ax.set_yticks(tick_marks)
    ax.set_yticklabels(labels)
    ax.set_ylabel('True Label')
    ax.set_xlabel('Predicted Label')
    ax.grid(False)
    return fig, ax 

def _plot_rmsmap(outfil, typ, savefig=True):
    rmsmap = alf.io.load_object(outpath, '_iblqc_ephysTimeRms' + typ.upper())
    plt.figure(figsize=[12, 4.5])
    axim = plt.axes([0.2, 0.1, 0.7, 0.8])
    axrms = plt.axes([0.05, 0.1, 0.15, 0.8])
    axcb = plt.axes([0.92, 0.1, 0.02, 0.8])

    axrms.plot(np.median(rmsmap['rms'], axis=0)[:-1] * 1e6, np.arange(1, rmsmap['rms'].shape[1]))
    axrms.set_ylim(0, rmsmap['rms'].shape[1])

    im = axim.imshow(20 * np.log10(rmsmap['rms'].T + 1e-15), aspect='auto', origin='lower',
                     extent=[rmsmap['timestamps'][0], rmsmap['timestamps'][-1],
                             0, rmsmap['rms'].shape[1]])
    axim.set_xlabel(r'Time (s)')
    axim.set_ylabel(r'Channel Number')
    plt.colorbar(im, cax=axcb)
    if typ == 'ap':
        im.set_clim(-110, -90)
        axrms.set_xlim(100, 0)
    elif typ == 'lf':
        im.set_clim(-100, -60)
        axrms.set_xlim(500, 0)
    axim.set_xlim(0, 4000)
    if savefig:
        plt.savefig(outpath / (typ + '_rms.png'), dpi=150) 

def visualise_2D_grid(x, title, log=False):
    """
    Display 2D array data with a title. Optional: log for better visualisation of small values.
    :param x: 2D numpy array you want to visualise
    :param title: of the chart because it's nice to have one :-)
    :param log: True in order to log the values and make for better visualisation, False for raw numbers
    """
    if log:
        x = np.log10(x)
    cmap = colors.LinearSegmentedColormap.from_list('my_colormap', ['lightgrey', 'darkgrey', 'dimgrey', 'black'])
    cmap.set_bad(color='white')
    img = pyplot.imshow(x, cmap=cmap, interpolation='nearest')
    pyplot.colorbar(img, cmap=cmap)
    plt.title(title)
    # plt.savefig(title + u".png", dpi=200, transparent=True)  # Uncomment to save to file
    plt.show() 

def plot_graph(self, am, position=None, cls=None, fig_name='graph.png'):

        with warnings.catch_warnings():
            warnings.filterwarnings("ignore")

            g = nx.from_numpy_matrix(am)

            if position is None:
                position=nx.drawing.circular_layout(g)

            fig = plt.figure()

            if cls is None:
                cls='r'
            else:
                # Make a user-defined colormap.
                cm1 = mcol.LinearSegmentedColormap.from_list("MyCmapName", ["r", "b"])

                # Make a normalizer that will map the time values from
                # [start_time,end_time+1] -> [0,1].
                cnorm = mcol.Normalize(vmin=0, vmax=1)

                # Turn these into an object that can be used to map time values to colors and
                # can be passed to plt.colorbar().
                cpick = cm.ScalarMappable(norm=cnorm, cmap=cm1)
                cpick.set_array([])
                cls = cpick.to_rgba(cls)
                plt.colorbar(cpick, ax=fig.add_subplot(111))


            nx.draw(g, pos=position, node_color=cls, ax=fig.add_subplot(111))

            fig.savefig(os.path.join(self.plotdir, fig_name)) 

def matrix_visualization(matrix,title=None):
    """ Visualize 2D matrices like spectrograms or feature maps.
    """
    plt.figure()
    plt.imshow(np.flipud(matrix.T),interpolation=None)
    plt.colorbar()
    if title!=None:
        plt.title(title)
    plt.show() 

def visualize_attention(self,attention):
        # plot heatmap
        fig = plt.figure()
        rcParams.update({'font.size': 22})
        ax = fig.add_subplot(1,1,1)
        ax.set_aspect('equal')
        plt.imshow(attention, interpolation='nearest', cmap='hot')
        plt.colorbar()
        plt.title('Attention distribution')
        plt.ylabel('Step t')
        plt.xlabel('Attention_t')
        plt.show() 

def run_synthetic_SGLD():
    theta1 = 0
    theta2 = 1
    sigma1 = numpy.sqrt(10)
    sigma2 = 1
    sigmax = numpy.sqrt(2)
    X = load_synthetic(theta1=theta1, theta2=theta2, sigmax=sigmax, num=100)
    minibatch_size = 1
    total_iter_num = 1000000
    lr_scheduler = SGLDScheduler(begin_rate=0.01, end_rate=0.0001, total_iter_num=total_iter_num,
                                 factor=0.55)
    optimizer = mx.optimizer.create('sgld',
                                    learning_rate=None,
                                    rescale_grad=1.0,
                                    lr_scheduler=lr_scheduler,
                                    wd=0)
    updater = mx.optimizer.get_updater(optimizer)
    theta = mx.random.normal(0, 1, (2,), mx.cpu())
    grad = nd.empty((2,), mx.cpu())
    samples = numpy.zeros((2, total_iter_num))
    start = time.time()
    for i in xrange(total_iter_num):
        if (i + 1) % 100000 == 0:
            end = time.time()
            print("Iter:%d, Time spent: %f" % (i + 1, end - start))
            start = time.time()
        ind = numpy.random.randint(0, X.shape[0])
        synthetic_grad(X[ind], theta, sigma1, sigma2, sigmax, rescale_grad=
        X.shape[0] / float(minibatch_size), grad=grad)
        updater('theta', grad, theta)
        samples[:, i] = theta.asnumpy()
    plt.hist2d(samples[0, :], samples[1, :], (200, 200), cmap=plt.cm.jet)
    plt.colorbar()
    plt.show() 

def _plot_item(W, name, full_name, nspaces):
  plt.figure()
  if W.shape == ():
    print(name, ": ", W)
  elif W.shape[0] == 1:
    plt.stem(W.T)
    plt.title(full_name)
  elif W.shape[1] == 1:
    plt.stem(W)
    plt.title(full_name)
  else:
    plt.imshow(np.abs(W), interpolation='nearest', cmap='jet');
    plt.colorbar()
    plt.title(full_name) 

def plot_priors():
  g0s_prior_mean_bxn = train_modelvals['prior_g0_mean']
  g0s_prior_var_bxn = train_modelvals['prior_g0_var']
  g0s_post_mean_bxn = train_modelvals['posterior_g0_mean']
  g0s_post_var_bxn = train_modelvals['posterior_g0_var']

  plt.figure(figsize=(10,4), tight_layout=True);
  plt.subplot(1,2,1)
  plt.hist(g0s_post_mean_bxn.flatten(), bins=20, color='b');
  plt.hist(g0s_prior_mean_bxn.flatten(), bins=20, color='g');

  plt.title('Histogram of Prior/Posterior Mean Values')
  plt.subplot(1,2,2)
  plt.hist((g0s_post_var_bxn.flatten()), bins=20, color='b');
  plt.hist((g0s_prior_var_bxn.flatten()), bins=20, color='g');
  plt.title('Histogram of Prior/Posterior Log Variance Values')

  plt.figure(figsize=(10,10), tight_layout=True)
  plt.subplot(2,2,1)
  plt.imshow(g0s_prior_mean_bxn.T, interpolation='nearest', cmap='jet')
  plt.colorbar(fraction=0.025, pad=0.04)
  plt.title('Prior g0 means')

  plt.subplot(2,2,2)
  plt.imshow(g0s_post_mean_bxn.T, interpolation='nearest', cmap='jet')
  plt.colorbar(fraction=0.025, pad=0.04)
  plt.title('Posterior g0 means');

  plt.subplot(2,2,3)
  plt.imshow(g0s_prior_var_bxn.T, interpolation='nearest', cmap='jet')
  plt.colorbar(fraction=0.025, pad=0.04)
  plt.title('Prior g0 variance Values')

  plt.subplot(2,2,4)
  plt.imshow(g0s_post_var_bxn.T, interpolation='nearest', cmap='jet')
  plt.colorbar(fraction=0.025, pad=0.04)
  plt.title('Posterior g0 variance Values')

  plt.figure(figsize=(10,5))
  plt.stem(np.sort(np.log(g0s_post_mean_bxn.std(axis=0))));
  plt.title('Log standard deviation of h0 means'); 

def plot_confusion_matrix(y_true, y_test, classes,
                          normalize=False,
                          title='Confusion matrix',
                          cmap=plt.cm.Blues):
    """
    This function prints and plots the confusion matrix.
    Normalization can be applied by setting `normalize=True`.
    """
    cm = confusion_matrix(y_true, y_test)
    if normalize:
        cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis]
        print("Normalized confusion matrix")
    else:
        print('Confusion matrix, without normalization')

    plt.imshow(cm, interpolation='nearest', cmap=cmap)
    plt.title(title)
    plt.colorbar()
    tick_marks = np.arange(len(classes))
    plt.xticks(tick_marks, classes, rotation=45)
    plt.yticks(tick_marks, classes)

    fmt = '.2f' if normalize else 'd'
    thresh = cm.max() / 2.
    for i, j in itertools.product(range(cm.shape[0]), range(cm.shape[1])):
        plt.text(j, i, format(cm[i, j], fmt),
                 horizontalalignment="center",
                 color="white" if cm[i, j] > thresh else "black")

    plt.tight_layout()
    plt.ylabel('True label')
    plt.xlabel('Predicted label') 

def show_melspectrogram(mels, title='Log-frequency power spectrogram'):
    import matplotlib.pyplot as plt

    librosa.display.specshow(mels, x_axis='time', y_axis='mel',
                             sr=config.sampling_rate, hop_length=config.hop_length,
                             fmin=config.fmin, fmax=config.fmax)
    plt.colorbar(format='%+2.0f dB')
    plt.title(title)
    plt.show() 

def plotGraph(x, y, z, filename):
	v = [0,5000,0,200]
	plt.axis(v)
	plt.scatter(x, y, alpha = 0.10, cmap=plt.cm.cool, edgecolors='None')
	# plt.colorbar()
	pylab.savefig(filename, bbox_inches = 0)
	plt.clf()

#scale input data and plot graphs 

def plot_confusion_matrix(cm, labels, title='Confusion matrix', cmap=plt.cm.Blues):
        plt.imshow(cm, interpolation='nearest', cmap=cmap)
        #plt.title(title, **csfont)
        plt.colorbar()
        tick_marks = np.arange(len(labels))
        plt.xticks(tick_marks, labels, rotation=90)
        plt.yticks(tick_marks, labels)
        #plt.xticks(tick_marks, rotation=90)
        #plt.yticks(tick_marks) 
        csfont = {'fontname':'Times', 'fontsize':'17'}
        plt.tight_layout()
        plt.ylabel('True label', **csfont)
        plt.xlabel('Predicted label', **csfont) 

def test_to_nonlinear_grid_nodedata(self, sphere3_msh):
        import nibabel
        data = sphere3_msh.nodes.node_coord[:, 0]
        f = mesh_io.NodeData(data, mesh=sphere3_msh)
        affine = np.array([[1, 0, 0, -100.5],
                           [0, 1, 0, -5],
                           [0, 0, 1, 0],
                           [0, 0, 0, 1]], dtype=float)
        x, y, z = np.meshgrid(np.arange(-100, 100),
                              np.arange(-5, 5),
                              np.arange(0, 1),
                              indexing='ij')
        nonl_transform = np.concatenate(
            (x[..., None], y[..., None], z[..., None]), axis=3).astype(float)
        img = nibabel.Nifti1Pair(nonl_transform, affine)
        tempf = tempfile.NamedTemporaryFile(suffix='.nii', delete=False)
        fn = tempf.name
        tempf.close()
        nibabel.save(img, fn)
        interp = f.to_deformed_grid(fn, fn, tags=3, order=1)
        interp = interp.get_data()
        '''
        import matplotlib.pyplot as plt
        plt.figure()
        plt.imshow(np.squeeze(interp))
        plt.colorbar()
        plt.show()
        '''
        assert np.isclose(interp[150, 5, 0], 50)
        assert np.isclose(interp[190, 5, 0], 0)
        assert np.isclose(interp[193, 5, 0], 0)
        assert np.isclose(interp[198, 5, 0], 0)