Chaquopy中不能导入64位Python训练的机器学习模型（32bit与64bit不兼容）

不念不忘少年蓝@ 2022-11-03 11:10 89阅读 0赞

我在Chaquopy中利用joblib来load一个在pycharm中写好的AdaBoost模型：

from joblib import dump, load
    filename = join(dirname(__file__), 'gao1_to_gao2_1.pkl')
    clf = load(filename)

报错如下：

E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.NCEPU, PID: 18024
        com.chaquo.python.PyException: ValueError: Buffer dtype mismatch, expected 'SIZE_t' but got 'long long'
            at <python>.sklearn.tree._tree.Tree.__cinit__(_tree.pyx:607)
            at <python>.pickle.load_reduce(pickle.py:1587)
            at <python>.pickle.load(pickle.py:1210)
            at <python>.joblib.numpy_pickle._unpickle(numpy_pickle.py:504)
            at <python>.joblib.numpy_pickle.load(numpy_pickle.py:585)
            at <python>.AdaBoost.test(AdaBoost.py:76)
            at <python>.chaquopy_java.call(chaquopy_java.pyx:380)
            at <python>.chaquopy_java.Java_com_chaquo_python_PyObject_callAttrThrowsNative(chaquopy_java.pyx:352)
            at com.chaquo.python.PyObject.callAttrThrowsNative(Native Method)
            at com.chaquo.python.PyObject.callAttrThrows(PyObject.java:232)
            at com.chaquo.python.PyObject.callAttr(PyObject.java:221)
            at com.example.NCEPU.Student.Predict.AdaBoostActivity.callPythonCode(AdaBoostActivity.java:45)
            at com.example.NCEPU.Student.Predict.AdaBoostActivity.createList(AdaBoostActivity.java:61)
            at com.example.NCEPU.Student.Predict.AdaBoostActivity.lambda$initViews$1$AdaBoostActivity(AdaBoostActivity.java:56)
            at com.example.NCEPU.Student.Predict.-$$Lambda$AdaBoostActivity$dJAvP4dDDrPleKcJgBCESW0ea0M.onClick(Unknown Source:2)
            at android.view.View.performClick(View.java:7192)
            at android.view.View.performClickInternal(View.java:7166)
            at android.view.View.access$3500(View.java:824)
            at android.view.View$PerformClick.run(View.java:27592)
            at android.os.Handler.handleCallback(Handler.java:888)
            at android.os.Handler.dispatchMessage(Handler.java:100)
            at android.os.Looper.loop(Looper.java:213)
            at android.app.ActivityThread.main(ActivityThread.java:8169)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)

翻遍stackoverflow发现是因为32位Python不能导入64位训练的模型，于是在Chaquopy中输出一下：

import platform
    print(platform.architecture())

输出为：

('32bit', 'WindowsPE')

果然，Chaquopy中Python默认是32位。那没办法，只能用32位Python训练模型然后再导入了。

## 1.安装32位python ##

在官网下载32位的python38，然后安装，这个不再叙述。  
  安装后在Pycharm上配置：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0N5cmlsX0tJ_size_16_color_FFFFFF_t_70]  
  这个时候在pycharm上打印：

import platform
    print(platform.architecture())

输出为：

('32bit', 'WindowsPE')

可以看到当前版本已经是32位了

## 2.安装skleanr和pandas ##

直接在pycharm的Terminal中安装：

pip install sklearn -i https://pypi.douban.com/simple
    pip install pandas -i https://pypi.douban.com/simple

安装过程有极大概率会报错，这中间省略了很多细节。。。。因为问题实在太多了，忘记记录了。不过最后是升级了一下pip就OK了。

## 3.训练模型并保存 ##

这一步是在pycharm中进行的：

clf = AdaBoostClassifier(base_estimator=DecisionTreeClassifier(max_depth=7, min_samples_leaf=5),
                                 n_estimators=200,
                                 algorithm='SAMME', learning_rate=0.5)
    clf = clf.fit(train_x, train_y)  # 训练模型
    dump(clf, 'gao1_to_gao2_1.pkl')

## 4.Chaquopy中加载模型 ##

gao1\_to\_gao2\_1.pkl放在python文件夹下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0N5cmlsX0tJ_size_16_color_FFFFFF_t_70_pic_center]

from joblib import dump, load
    filename = join(dirname(__file__), 'gao1_to_gao2_1.pkl')
    clf = load(filename)

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0N5cmlsX0tJ_size_16_color_FFFFFF_t_70]: /images/20221024/921c0f3a6cb7462e9a1a3ea6047a31ce.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0N5cmlsX0tJ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221024/6b3d45ac561445be84e26a35e0d14d3a.png