帮我写一个数据集为wav文件神的经网络关键词语音识别代码
时间: 2023-08-28 19:10:02 浏览: 61
好的,首先需要明确的是你需要一个训练好的神经网络模型,用于关键词语音识别。这个模型需要使用语音数据集进行训练。在这里我提供一份代码示例,以帮助你更好地理解如何进行关键词语音识别。
首先,我们需要导入一些必要的模块和库:
```python
import os
import numpy as np
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import layers
```
接着,我们定义一些超参数:
```python
num_mfcc = 13 # MFCC数量
num_frames = 44 # 每个样本的帧数
n_classes = 10 # 关键词类别数
```
然后,我们需要加载数据集并对其进行预处理。在这里,我将使用一个简单的数据集,里面包含了10个不同的关键词,每个关键词有50个样本。你可以根据自己的需求替换数据集。
```python
# 加载数据集
def load_data(data_path):
labels = []
mfccs = []
for label in os.listdir(data_path):
for mfcc_file in os.listdir(os.path.join(data_path, label)):
mfcc = np.load(os.path.join(data_path, label, mfcc_file)) # 加载MFCC数据
mfcc = mfcc.T[:num_mfcc, :num_frames] # 裁剪MFCC数据
mfccs.append(mfcc)
labels.append(label)
mfccs = np.asarray(mfccs)
labels = np.asarray(labels)
return mfccs, labels
# 预处理数据集
def preprocess_dataset(data_path):
mfccs, labels = load_data(data_path)
# 转换标签为one-hot编码
labels_onehot = np.zeros([len(labels), n_classes])
for i, label in enumerate(labels):
labels_onehot[i][int(label)] = 1
# 打乱数据
indices = np.arange(len(mfccs))
np.random.shuffle(indices)
mfccs = mfccs[indices]
labels_onehot = labels_onehot[indices]
# 划分训练集和测试集
split_idx = int(0.8 * len(mfccs))
train_mfccs, test_mfccs = mfccs[:split_idx], mfccs[split_idx:]
train_labels, test_labels = labels_onehot[:split_idx], labels_onehot[split_idx:]
return train_mfccs, train_labels, test_mfccs, test_labels
```
接下来,我们需要定义一个卷积神经网络模型,用于关键词语音识别。在这里,我将使用一个简单的模型,你可以根据自己的需求进行修改。
```python
# 定义模型
def create_model():
model = keras.Sequential()
model.add(layers.Conv2D(32, (3, 3), activation='relu', input_shape=(num_frames, num_mfcc, 1)))
model.add(layers.MaxPooling2D((2, 2)))
model.add(layers.Conv2D(64, (3, 3), activation='relu'))
model.add(layers.MaxPooling2D((2, 2)))
model.add(layers.Flatten())
model.add(layers.Dense(64, activation='relu'))
model.add(layers.Dense(n_classes, activation='softmax'))
model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy'])
return model
```
最后,我们需要训练模型并进行预测。在这里,我将使用上面定义的数据集和模型进行训练和预测。
```python
# 训练模型
def train_model(data_path):
train_mfccs, train_labels, test_mfccs, test_labels = preprocess_dataset(data_path)
model = create_model()
model.fit(train_mfccs[..., np.newaxis], train_labels, epochs=10, batch_size=32, validation_data=(test_mfccs[..., np.newaxis], test_labels))
return model
# 预测
def predict(model, mfcc):
mfcc = mfcc[np.newaxis, ..., np.newaxis]
prediction = model.predict(mfcc)
return np.argmax(prediction)
```
完整的代码如下:
```python
import os
import numpy as np
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import layers
num_mfcc = 13 # MFCC数量
num_frames = 44 # 每个样本的帧数
n_classes = 10 # 关键词类别数
# 加载数据集
def load_data(data_path):
labels = []
mfccs = []
for label in os.listdir(data_path):
for mfcc_file in os.listdir(os.path.join(data_path, label)):
mfcc = np.load(os.path.join(data_path, label, mfcc_file)) # 加载MFCC数据
mfcc = mfcc.T[:num_mfcc, :num_frames] # 裁剪MFCC数据
mfccs.append(mfcc)
labels.append(label)
mfccs = np.asarray(mfccs)
labels = np.asarray(labels)
return mfccs, labels
# 预处理数据集
def preprocess_dataset(data_path):
mfccs, labels = load_data(data_path)
# 转换标签为one-hot编码
labels_onehot = np.zeros([len(labels), n_classes])
for i, label in enumerate(labels):
labels_onehot[i][int(label)] = 1
# 打乱数据
indices = np.arange(len(mfccs))
np.random.shuffle(indices)
mfccs = mfccs[indices]
labels_onehot = labels_onehot[indices]
# 划分训练集和测试集
split_idx = int(0.8 * len(mfccs))
train_mfccs, test_mfccs = mfccs[:split_idx], mfccs[split_idx:]
train_labels, test_labels = labels_onehot[:split_idx], labels_onehot[split_idx:]
return train_mfccs, train_labels, test_mfccs, test_labels
# 定义模型
def create_model():
model = keras.Sequential()
model.add(layers.Conv2D(32, (3, 3), activation='relu', input_shape=(num_frames, num_mfcc, 1)))
model.add(layers.MaxPooling2D((2, 2)))
model.add(layers.Conv2D(64, (3, 3), activation='relu'))
model.add(layers.MaxPooling2D((2, 2)))
model.add(layers.Flatten())
model.add(layers.Dense(64, activation='relu'))
model.add(layers.Dense(n_classes, activation='softmax'))
model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy'])
return model
# 训练模型
def train_model(data_path):
train_mfccs, train_labels, test_mfccs, test_labels = preprocess_dataset(data_path)
model = create_model()
model.fit(train_mfccs[..., np.newaxis], train_labels, epochs=10, batch_size=32, validation_data=(test_mfccs[..., np.newaxis], test_labels))
return model
# 预测
def predict(model, mfcc):
mfcc = mfcc[np.newaxis, ..., np.newaxis]
prediction = model.predict(mfcc)
return np.argmax(prediction)
```
希望这份代码能够帮助到你。