将 Pyobject 转换为 java 数组时出现类型错误

typeerror while converting Pyobject to java array

pythor 脚本 returns 2d 'float64' numpy 数组。当我尝试将它分配给 java 中的 'double' 数组时,出现此错误“java.lang.ClassCastException:TypeError:无法将 float64 对象转换为 double[]”


编辑

import librosa as lb 
import numpy as np 
from os.path import dirname, join                                      

def build_feat(fpath):
     filename = join(dirname(__file__), fpath)
     wav,  rate = lb.load(filename, sr=4000)
     X_sample = lb.feature.mfcc(wav, sr=rate, n_fft=512,  win_length=400, n_mfcc=20,
                                hop_length = 256, n_mels = 128, fmin = 100, fmax = 1800)
     X = X_sample.T
     return X

Java代码:

PyObject pyobj = py.getModule("featureExtraction");         
PyObject obj = pyobj.callAttr("build_feat","107_2b4_Pl_mc_AKGC417L_0.wav");
double[][] feat = obj.toJava(double[][].class);

对于相同的代码,我现在收到不同的错误:com.chaquo.python.PyException: ValueError: ndarray is not contiguous

问题是由数组被转置引起的,因此 non-contiguous。

此问题已在 Chaquopy 9.0.0 中修复。对于旧版本,您可以通过返回原始数组 (X_sample) 或使转置后的副本 (X_sample.T.copy()).