如何在使用IJava内核的Jupyter Notebook中嵌入Tablesaw图表？

Question

如何在使用IJava内核的Jupyter Notebook中嵌入Tablesaw图表？

4

我希望使用IJava内核在Jupyter Notebook中嵌入Tablesaw交互式图表。我意识到Tablesaw可能无法直接实现这一点，但我愿意花费一些精力来实现它。我是Java专家，但我对Jupyter Notebook和IJava内核都很陌生，所以不知道从哪里开始。是否有一些API可以用于Jupyter Notebook或IJava以嵌入对象？

首先，我安装了Anaconda，然后在Jupyter Notebook中轻松安装了IJava内核。到目前为止，在Windows 10上使用OpenJDK 11没有任何问题！接下来，我尝试使用Tablesaw。我能够添加其Maven依赖项，加载CSV文件并创建一个图表。非常好！

但是，为了生成图表，Tablesaw使用Plotly生成临时HTML文件，并调用浏览器显示交互式图表。换句话说，图表不会出现在Jupyter Notebook中。

Tablesaw展示了一个嵌入图表的示例，使用的是BeakerX内核（不是IJava）。正如您可以看到的那样（向下滚动至“Play（Money）ball with Linear Regression”），他们正在Jupyter笔记本中直接嵌入Tablesaw的Plot。因此，我知道在具有Java内核的Jupyter Notebook中概念上嵌入交互式Tablesaw图表是可能的。

这种能力是特定于BeakerX吗？我想切换到BeakerX，但从文档中我没有看到关于BeakerX支持Java 9+的任何内容。此外，IJava似乎是一种更简洁的实现，直接构建在JShell之上。

我应该从哪里开始找出如何像BeakerX一样使用IJava内核，在Jupyter Notebook中将Tablesaw的Plot对象作为交互式图形嵌入？

- Garret Wilson

2个回答

0

尝试使用命令提示符并使用pip install Tablesaw，然后使用其他建议。

- Brandon Nova

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- SpencerPark · Accepted Answer

IJava内核有两个主要的display_data函数; display和render。两者都与base kernel中的Renderer相连接。我们可以为tablesaw的Figure类型注册一个渲染函数。

Add the tablesaw-jsplot dependency (and all required transitive dependencies) via the loadFromPOM cell magic:

%%loadFromPOM
<dependency>
    <groupId>tech.tablesaw</groupId>
    <artifactId>tablesaw-jsplot</artifactId>
    <version>0.30.4</version>
</dependency>

Register a render function for IJava's renderer.

We create a registration for tech.tablesaw.plotly.components.Figure.
If an output type is not specified during the render then we want it to default to text/html (with the preferring call).
If an html render is requested, we build the target <div> as well as the javascript that invokes a plotly render into that <div>. Most of this logic is done via tablesaw's asJavascript method but hooks into Jupyter notebook's require AMD module setup.

import io.github.spencerpark.ijava.IJava;

IJava.getKernelInstance().getRenderer()
    .createRegistration(tech.tablesaw.plotly.components.Figure.class)
    .preferring(io.github.spencerpark.jupyter.kernel.display.mime.MIMEType.TEXT_HTML)
    .register((figure, ctx) -> {
        ctx.renderIfRequested(io.github.spencerpark.jupyter.kernel.display.mime.MIMEType.TEXT_HTML, () -> {
            String id = UUID.randomUUID().toString().replace("-", "");

            figure.asJavascript(id);
            Map<String, Object> context = figure.getContext();

            StringBuilder html = new StringBuilder();
            html.append("<div id=\"").append(id).append("\"></div>\n");
            html.append("<script>require(['https://cdn.plot.ly/plotly-1.44.4.min.js'], Plotly => {\n");
            html.append("var target_").append(id).append(" = document.getElementById('").append(id).append("');\n");
            html.append(context.get("figure")).append('\n');
            html.append(context.get("plotFunction")).append('\n');
            html.append("})</script>\n");
            return html.toString();
        });
    });

Then we can create a table to display (taken from the Tablesaw docs).

import tech.tablesaw.api.*;
import tech.tablesaw.plotly.api.*;
import tech.tablesaw.plotly.components.*;

String[] animals = {"bear", "cat", "giraffe"};
double[] cuteness = {90.1, 84.3, 99.7};

Table cuteAnimals = Table.create("Cute Animals")
    .addColumns(
        StringColumn.create("Animal types", animals),
        DoubleColumn.create("rating", cuteness)
    );
cuteAnimals

Finally we can create a Figure for the table and display it via one of 3 methods for displaying things in IJava.
```
VerticalBarPlot.create("Cute animals", cuteAnimals, "Animal types", "rating");
```
which is equivalent to a render call where the "text/html" is implicit because we set it as the preferred type (preferring during registration)
```
render(VerticalBarPlot.create("Cute animals", cuteAnimals, "Animal types", "rating"), "text/html");
```
and if it is not at the end of a cell, the display function is another option. For example to display the chart and the cuteAnimals afterwards:
```
Figure figure = VerticalBarPlot.create("Cute animals", cuteAnimals, "Animal types", "rating");
display(figure);

cuteAnimals
```