Bokeh:滑块没有更新Hbar图上的结果

from bokeh.models import Slider, ColumnDataSource
from bokeh.plotting import figure, show
from bokeh.layouts import column
from bokeh.io import curdoc

# 创建滑块和Hbar图表的数据源
source = ColumnDataSource(data=dict(value=[]))
hbar_source = ColumnDataSource(data=dict(y=[], height=[]))

# 创建滑块和Hbar图表
slider = Slider(start=0, end=10, step=1, value=0, title="滑块")
hbar_chart = figure(y_range=[0], plot_width=400, plot_height=400, title="Hbar图表")
hbar_chart.hbar(y="y", height="height", source=hbar_source)

# 定义滑块的回调函数
def slider_callback(attr, old, new):
    # 更新Hbar图表的数据源
    hbar_source.data = dict(y=[0], height=[new])

# 绑定滑块的回调函数
slider.on_change('value', slider_callback)

# 创建布局并显示
layout = column(slider, hbar_chart)
curdoc().add_root(layout)
show(layout)