Test failure in i686 with version 1.3.1

### Describe the bug

During the build of scikit-learn for Fedora Linux, I'm obtaining an error runing the tests in i686. The test that fails is:

`sklearn/tree/tests/test_export.py::test_graphviz_toy`

### Steps/Code to Reproduce

In a i686 machine

```
pytest sklearn/tree/tests/test_export.py
```

### Expected Results

Test passes

### Actual Results

```
sklearn/tree/tests/test_export.py::test_graphviz_toy FAILED              [ 93%]
=================================== FAILURES ===================================
______________________________ test_graphviz_toy _______________________________
    def test_graphviz_toy():
        # Check correctness of export_graphviz
        clf = DecisionTreeClassifier(
            max_depth=3, min_samples_split=2, criterion="gini", random_state=2
        )
        clf.fit(X, y)
    
        # Test export code
        contents1 = export_graphviz(clf, out_file=None)
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="x[0] <= 0.0\\ngini = 0.5\\nsamples = 6\\n'
            'value = [3, 3]"] ;\n'
            '1 [label="gini = 0.0\\nsamples = 3\\nvalue = [3, 0]"] ;\n'
            "0 -> 1 [labeldistance=2.5, labelangle=45, "
            'headlabel="True"] ;\n'
            '2 [label="gini = 0.0\\nsamples = 3\\nvalue = [0, 3]"] ;\n'
            "0 -> 2 [labeldistance=2.5, labelangle=-45, "
            'headlabel="False"] ;\n'
            "}"
        )
    
        assert contents1 == contents2
    
        # Test plot_options
        contents1 = export_graphviz(
            clf,
            filled=True,
            impurity=False,
            proportion=True,
            special_characters=True,
            rounded=True,
            out_file=None,
            fontname="sans",
        )
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, style="filled, rounded", color="black", '
            'fontname="sans"] ;\n'
            'edge [fontname="sans"] ;\n'
            "0 [label=<x<SUB>0</SUB> &le; 0.0<br/>samples = 100.0%<br/>"
            'value = [0.5, 0.5]>, fillcolor="#ffffff"] ;\n'
            "1 [label=<samples = 50.0%<br/>value = [1.0, 0.0]>, "
            'fillcolor="#e58139"] ;\n'
            "0 -> 1 [labeldistance=2.5, labelangle=45, "
            'headlabel="True"] ;\n'
            "2 [label=<samples = 50.0%<br/>value = [0.0, 1.0]>, "
            'fillcolor="#399de5"] ;\n'
            "0 -> 2 [labeldistance=2.5, labelangle=-45, "
            'headlabel="False"] ;\n'
            "}"
        )
    
        assert contents1 == contents2
    
        # Test max_depth
        contents1 = export_graphviz(clf, max_depth=0, class_names=True, out_file=None)
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="x[0] <= 0.0\\ngini = 0.5\\nsamples = 6\\n'
            'value = [3, 3]\\nclass = y[0]"] ;\n'
            '1 [label="(...)"] ;\n'
            "0 -> 1 ;\n"
            '2 [label="(...)"] ;\n'
            "0 -> 2 ;\n"
            "}"
        )
    
        assert contents1 == contents2
    
        # Test max_depth with plot_options
        contents1 = export_graphviz(
            clf, max_depth=0, filled=True, out_file=None, node_ids=True
        )
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, style="filled", color="black", '
            'fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="node #0\\nx[0] <= 0.0\\ngini = 0.5\\n'
            'samples = 6\\nvalue = [3, 3]", fillcolor="#ffffff"] ;\n'
            '1 [label="(...)", fillcolor="#C0C0C0"] ;\n'
            "0 -> 1 ;\n"
            '2 [label="(...)", fillcolor="#C0C0C0"] ;\n'
            "0 -> 2 ;\n"
            "}"
        )
    
        assert contents1 == contents2
    
        # Test multi-output with weighted samples
        clf = DecisionTreeClassifier(
            max_depth=2, min_samples_split=2, criterion="gini", random_state=2
        )
        clf = clf.fit(X, y2, sample_weight=w)
    
>       contents1 = export_graphviz(clf, filled=True, impurity=False, out_file=None)
sklearn/tree/tests/test_export.py:131: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
sklearn/utils/_param_validation.py:211: in wrapper
    return func(*args, **kwargs)
sklearn/tree/_export.py:905: in export_graphviz
    exporter.export(decision_tree)
sklearn/tree/_export.py:465: in export
    self.recurse(decision_tree.tree_, 0, criterion=decision_tree.criterion)
sklearn/tree/_export.py:528: in recurse
    ', fillcolor="%s"' % self.get_fill_color(tree, node_id)
sklearn/tree/_export.py:285: in get_fill_color
    return self.get_color(node_val)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <sklearn.tree._export._DOTTreeExporter object at 0xc5080408>
value = -0.4691358024691358
    def get_color(self, value):
        # Find the appropriate color & intensity for a node
        if self.colors["bounds"] is None:
            # Classification tree
            color = list(self.colors["rgb"][np.argmax(value)])
            sorted_values = sorted(value, reverse=True)
            if len(sorted_values) == 1:
                alpha = 0.0
            else:
                alpha = (sorted_values[0] - sorted_values[1]) / (1 - sorted_values[1])
        else:
            # Regression tree or multi-output
            color = list(self.colors["rgb"][0])
            alpha = (value - self.colors["bounds"][0]) / (
                self.colors["bounds"][1] - self.colors["bounds"][0]
            )
        # compute the color as alpha against white
>       color = [int(round(alpha * c + (1 - alpha) * 255, 0)) for c in color]
E       ValueError: cannot convert float NaN to integer
```

### Versions

```shell
Version is 1.3.1
```

COMMENT:
Here's a small debuggable snippet that reproduces the issue, based on the failing test:

```py
from sklearn.tree import (
    DecisionTreeClassifier,
    export_graphviz,
)
import pdb

X = [[-2, -1], [-1, -1], [-1, -2], [1, 1], [1, 2], [2, 1]]
y2 = [[-1, 1], [-1, 1], [-1, 1], [1, 2], [1, 2], [1, 3]]
w = [1, 1, 1, 0.5, 0.5, 0.5]

def main():
    clf = DecisionTreeClassifier(
        max_depth=2, min_samples_split=2, criterion="gini", random_state=2
    )
    clf = clf.fit(X, y2, sample_weight=w)
    pdb.set_trace()

    contents1 = export_graphviz(clf, filled=True, impurity=False, out_file=None)

if __name__ == "__main__":
    main()
```

On an x86-64 (amd64 in Debian's terminology) system, I observe the following normal behavior by inspecting `clf.tree_` at the given breakpoint:

> (Pdb) clf.tree_.impurity
> array([0.4691358 , 0.        , 0.22222222, 0.        , 0.        ])
> (Pdb) -clf.tree_.impurity
> array([-0.4691358 , -0.        , -0.22222222, -0.        , -0.        ])

However, on Debian's i386 porterbox, we get this funny behavior with the negation:

> (Pdb) clf.tree_.impurity
> array([0.4691358 , 0.        , 0.22222222, 0.        , 0.        ])
> (Pdb) -clf.tree_.impurity
> array([-4.69135802e-001, -1.59149684e-314, -1.50000000e+000,      -2.12199579e-314,              nan])

This smells of some alignment issue on an FFI boundary, perhaps. It certainly explains the failing test (as the tested code does `np.min`  and `np.max` of  `-clf.tree_.impurity`).

Labels: Bug