====== Visdom ======


===== 이미지 축 변환 =====

일반 이미지(height x widht x channel)에서 torch (channel x height x width)로 변환

<code python>
def hwc2chw(img):
    assert img.shape == (84, 84, 3)
    return np.transpose(img, (2, 0, 1))  # (3, 84, 84)


def chw2hwc(img):
    assert img.shape == (3, 84, 84)
    return np.transpose(img, (1, 2, 0))  # (84, 84, 3)
</code>

이미지 보이기

<code python>
viz.image(o, win='name', opts=dict(width=256, height=256))
</code>

viz_line 편의함수

<code python>
viz = visdom.Visdom()


def viz_line_(viz, title, x, y, window_size=25, width=None, height=None, ymin=None, ymax=None):
    title_ = title.replace(' ', '_')

    if type(y) == dict:
        _, update = getattr(viz, '_{}'.format(title_), (None, None))
        legend, xs, ys = [], [], []
        for k, v in sorted(y.items()):
            k_ = k.replace(' ', '_')
            dq, _ = getattr(viz, '_{}'.format(k_), (collections.deque(maxlen=window_size), None))
            dq.append(v)
            legend.append(k)
            xs.append([x])
            ys.append([np.mean(dq)])

        viz.line(X=np.column_stack(xs), Y=np.column_stack(ys), win=title, update=update,
            opts=dict(title=title, width=width, height=height, legend=legend))
        setattr(viz, '_{}'.format(title_), (None, 'append'))
    else:
        dq, update = getattr(viz, '_{}'.format(title_), (collections.deque(maxlen=window_size), None))
        dq.append(y)
        y_mean = np.mean(dq)

        viz.line(X=[x], Y=[y_mean], win=title, update=update, 
            opts=dict(title=f'{title}: {y_mean}', width=width, height=height, ytickmin=ymin, ytickmax=ymax))
        setattr(viz, '_{}'.format(title_), (dq, 'append'))
    
viz_line = functools.partial(viz_line_, viz)
</code>