Python Keras librosa 神经网络音乐分析中的错误:scikit 导入中未识别的变量

Question

最近，我一直在尝试完成一个实验，即使用 Keras 创建一个神经网络音乐分析程序，并修改神经网络中的层数以找到对性能的影响。我的程序来源是以下网站：

https://medium.com/@navdeepsingh_2336/identifying-the-genre-of-a-song-with-neural-networks-851db89c42f0

我最近遇到了一些关于我的程序的错误，并且在Stack Overflow上另一位开发人员的建议下，我决定寻求Scikit库部分的帮助。

代码如下所示：

import librosa
import librosa.feature
import librosa.display
import glob
import numpy as np
import matplotlib.pyplot as plt
from keras.models import Sequential
from keras.layers import Dense, Activation
from keras.utils.np_utils import to_categorical
from sklearn.model_selection import train_test_split,        
StratifiedShuffleSplit, StratifiedKFold

def display_mfcc(song):
    y, _ = librosa.load(song)
    mfcc = librosa.feature.mfcc(y)
    plt.figure(figsize=(10, 4))
    librosa.display.specshow(mfcc, x_axis='time', y_axis='mel')
    plt.colorbar()
    plt.title(song)
    plt.tight_layout()
    plt.show()

def extract_features_song(f):
    y, _ = librosa.load(f)
    mfcc = librosa.feature.mfcc(y)
    mfcc /= np.amax(np.absolute(mfcc))
    return np.ndarray.flatten(mfcc)[:25000]
def generate_features_and_labels():
    all_features = []
    all_labels = []
    genres = ['blues', 'classical', 'country', 'disco', 'hiphop', 
    'jazz', 'metal', 'pop', 'reggae', 'rock']
    for genre in genres:
        sound_files = glob.glob('genres/'+genre+'/*.au')
        print('Processing %d songs in %s genre...' % 
        (len(sound_files), genre))
        for f in sound_files:
            features = extract_features_song(f)
            all_features.append(features)
            all_labels.append(genre)
    label_uniq_ids, label_row_ids = np.unique(all_labels, 
    return_inverse=True)
    label_row_ids = label_row_ids.astype(np.int32, copy=False)
    onehot_labels = to_categorical(label_row_ids,   
    len(label_uniq_ids))
    return np.stack(all_features), onehot_labels

features, labels = generate_features_and_labels()
print(np.shape(features))
print(np.shape(labels))
training_split = 0.8
alldata = np.column_stack((features, labels))
sss = StratifiedShuffleSplit(n_splits=1, test_size=0.20,  
random_state=37)
for train_index, test_index in sss.split(X, y):
  X_train, X_test = X[train_index], X[test_index]
  y_train, y_test = y[train_index], y[test_index]

print(np.shape(train))
print(np.shape(test))
train_input = test[:,:-10]
train_labels = train[:,-10:]
test_input = test[:,:-10]
test_labels = test[:,-10:]
print(np.shape(train_input))
print(np.shape(train_labels))
model = Sequential([
    Dense(100, input_dim=np.shape(train_input)[1]),
    Activation('relu'),
    Dense(10),
    Activation('softmax'),
    ])

 model.compile(optimizer='adam',
              loss='categorical_crossentropy',
              metrics=['accuracy'])
print(model.summary())
model.fit(train_input, train_labels, epochs=10, batch_size=32,
          validation_split=0.2) 
loss, acc = model.evaluate(test_input, test_labels, batch_size=32)
print('Done!')
print('Loss: %.4f, accuracy: %.4f' % (loss, acc))

Python 开始提供预期的响应，产生：

Processing 100 songs in blues genre...
Processing 100 songs in classical genre...
Processing 100 songs in country genre...
Processing 100 songs in disco genre...
Processing 100 songs in hiphop genre...
Processing 100 songs in jazz genre...
Processing 100 songs in metal genre...
Processing 100 songs in pop genre...
Processing 100 songs in reggae genre...
Processing 100 songs in rock genre...
(1000, 25000)
(1000, 10)

但中断了该过程并显示此错误消息：

Traceback (most recent call last):
  File "/Users/surengrigorian/Documents/Stage1.py", line 60, in     <module>
    for train_index, test_index in sss.split(X, y):
NameError: name 'X' is not defined

感谢您就此问题提供的任何帮助。

Answer 1

X

和 y 没有在您的代码中定义，我相信在您的情况下 X 等于特征，Y 等于标签

X=features
y=labels
for train_index, test_index in sss.split(X, y):
    X_train, X_test = X[train_index], X[test_index]
    y_train, y_test = y[train_index], y[test_index]

希望对您有所帮助