我有一个单通道图像,其中每个整数像素值映射到一个字符串。例如 5 -> '人'。我正在尝试创建一个交互式图像,其中将鼠标悬停在像素上将显示其相应的字符串。
我认为使用绘图热图可能是做到这一点的方法。我遇到的问题是:
z_text
使用空白值似乎是一个糟糕的解决方法,但设置 annotation_text=None
似乎不起作用。有人可以帮我吗?这是我得到的:
import numpy as np
import plotly.graph_objs as go
from plotly.offline import download_plotlyjs, init_notebook_mode, plot, iplot
init_notebook_mode(connected=True)
import plotly.figure_factory as ff
z = np.random.randint(0,6, size=(10, 10))
z_text = np.full(z.shape, '', dtype=str)
d = {0:'a', 1:'b', 2:'c', 3:'d', 4:'e', 5:'f'}
class_mat = np.vectorize(d.get)(z)
fig = ff.create_annotated_heatmap(z, annotation_text=z_text, text=class_mat, hoverinfo='text', colorscale='Viridis', )
fig.layout.title = 'Semantic Segmentation'
iplot(fig, filename='annotated_heatmap_text')
这是目前的样子:
此外,如果情节热图不是解决此问题的最佳方法,我很乐意听到任何替代方案!
注意:我当前正在 jupyterlab 内显示。
我不确定这里的每个细节是否正确,但下面代码片段中的代码将在 Jupyter Notebook 中生成以下绘图。处理纵横比的行是:
fig['layout']['yaxis']['scaleanchor']='x'
您还可以使用:
fig.update_layout(yaxis = dict(scaleanchor = 'x'))
图1:
情节2:
只需确保包括:
fig.update_layout(plot_bgcolor='rgba(0,0,0,0)')
否则你最终会得到这样的结果:
代码 1 - 我对示例的编辑:
fig.data[0]['hoverinfo'] = 'all'
fig['layout']['yaxis']['scaleanchor']='x'
fig['layout']['xaxis']['gridcolor'] = 'rgba(0, 0, 0, 0)'
fig['layout']['yaxis']['gridcolor'] = 'rgba(0, 0, 0, 0)'
fig['layout']['yaxis']['color'] = 'rgba(0, 0, 0, 0)'
代码 2 - 轻松复制和粘贴的全部内容:
import numpy as np
import plotly.graph_objs as go
from plotly.offline import download_plotlyjs, init_notebook_mode, plot, iplot
init_notebook_mode(connected=True)
import plotly.figure_factory as ff
#%qtconsole
z = np.random.randint(0,6, size=(10, 10))
z_text = np.full(z.shape, '', dtype=str)
d = {0:'a', 1:'b', 2:'c', 3:'d', 4:'e', 5:'f'}
class_mat = np.vectorize(d.get)(z)
fig = ff.create_annotated_heatmap(z, annotation_text=z_text,
text=class_mat, hoverinfo='text', colorscale='Viridis',
# x = list('ABCDEFGHIJ'),
# y = list('ABCDEFGHIJ')
)
fig.layout.title = 'Semantic Segmentation'
# My suggestions:
fig.data[0]['hoverinfo'] = 'all'
fig['layout']['yaxis']['scaleanchor']='x'
fig['layout']['xaxis']['gridcolor'] = 'rgba(0, 0, 0, 0)'
fig['layout']['yaxis']['gridcolor'] = 'rgba(0, 0, 0, 0)'
fig['layout']['yaxis']['color'] = 'rgba(0, 0, 0, 0)'
fig.update_layout(plot_bgcolor='rgba(0,0,0,0)')
fig.show()
速度:
即使这个小数字也需要一些时间来绘制,但到目前为止我还没有任何关于如何加快速度的建议。
此外,如果您使用
plotly.express.imshow
来绘制热图,该函数 aspect='auto'
会有一个参数,它将更新纵横比以填充绘图所具有的空间。
例如:
import plotly.express as px
# fill/load df accordingly to your needs
fig = px.imshow(df, aspect='auto')
相当老了,但对于其他关注热图性能问题(特别是带注释的热图替代方案)的人来说,这些可能是相关的:
看来这两个答案都不适用于子图: https://stackoverflow.com/a/55239488/2215205 https://stackoverflow.com/a/71579181/2215205
px.imshow(df,aspect ='equal')被fig.add_trace()完全忽略。
在这方面操作图形布局仅适用于第一个子图,而不是全部:
import pandas as pd
import plotly.express as px
import plotly.graph_objects as go
## Example data
df = pd.DataFrame([[0,0,0,0,0],
[0,0,1,0,0],
[0,1,2,1,0],
[0,0,1,0,0],
[0,0,0,0,0],
])
## Subplots w/ go.Heatmap()
layout = dict(
# yaxis=...,
# xaxis=...,
# width=plot_width,
# height=plot_height,
# autosize=False,
yaxis_scaleanchor="x" , # <---- only works in 1st subplot :(
)
fig = go.Figure(layout=layout).set_subplots(rows=1, cols=2, subplot_titles=['#1', '#2'])
fig.add_trace(
go.Heatmap(
z = df,
coloraxis = "coloraxis", # use a common coloraxis for all subplots
),
1,1)
fig.add_trace(
go.Heatmap(
z = df*2,
coloraxis = "coloraxis", # use a common coloraxis for all subplots
),
1,2)
## Update y-axes
fig.update_yaxes(
title_text="yaxis #1",
row=1, col=1,
scaleanchor='x', # <---- only works in 1st subplot :( ==> works in Colab !!
)
fig.update_yaxes(
title_text="yaxis #2",
row=1, col=2,
scaleanchor='x', # <---- only works in 1st subplot :( ==> works in Colab !!
)
## Update layout
# fig['layout']['yaxis']['scaleanchor']='x' # <--- updates only first subplot :(
fig.update_layout(
title='2D Heatmaps',
autosize=False,
# yaxis_scaleanchor="x", # <--- updates only first subplot :(
yaxis = dict(scaleanchor = 'x'), # <--- updates only first subplot :(
# coloraxis_colorscale='Viridis',
)
# fig.show()
非常感谢任何帮助。
请通过我的努力在这里找到一个Jupyter-Notebook: https://colab.research.google.com/drive/13NKNmgAXudXp62UlmXKDhVFgpFe1YeQN?usp=sharing