175 lines
7.8 KiB
Python
175 lines
7.8 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Copyright 2016-2099 Ailemon.net
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#
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# This file is part of ASRT Speech Recognition Tool.
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#
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# ASRT is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# ASRT is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with ASRT. If not, see <https://www.gnu.org/licenses/>.
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# ============================================================================
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"""
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@author: nl8590687
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若干声学模型模型的定义
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"""
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from tensorflow.keras.models import Model
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from tensorflow.keras.layers import Dense, Dropout, Input, Reshape, BatchNormalization
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from tensorflow.keras.layers import Lambda, Activation,Conv2D, MaxPooling2D
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from tensorflow.keras import backend as K
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class BaseModel:
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'''
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定义声学模型类型的接口基类
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'''
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def __init__(self):
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self.input_shape = None
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self.output_size = None
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def get_model(self) -> tuple:
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raise Exception("method not implemented")
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def get_train_model(self) -> Model:
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raise Exception("method not implemented")
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def get_eval_model(self) -> Model:
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raise Exception("method not implemented")
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def load_weights(self, filename) -> None:
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raise Exception("method not implemented")
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def save_weights(self, filename) -> None:
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raise Exception("method not implemented")
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def get_model_name(self) -> str:
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raise Exception("method not implemented")
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def get_loss_function(self):
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raise Exception("method not implemented")
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def ctc_lambda_func(args):
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y_pred, labels, input_length, label_length = args
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y_pred = y_pred[:, :, :]
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return K.ctc_batch_cost(labels, y_pred, input_length, label_length)
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class SpeechModel251(BaseModel):
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'''
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定义CNN+CTC模型，使用函数式模型
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输入层：200维的特征值序列，一条语音数据的最大长度设为1600（大约16s）\\
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隐藏层：卷积池化层，卷积核大小为3x3，池化窗口大小为2 \\
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隐藏层：全连接层 \\
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输出层：全连接层，神经元数量为self.MS_OUTPUT_SIZE，使用softmax作为激活函数， \\
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CTC层：使用CTC的loss作为损失函数，实现连接性时序多输出
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参数： \\
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input_shape: tuple，默认值(1600, 200, 1) \\
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output_shape: tuple，默认值(200, 1428)
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'''
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def __init__(self, input_shape :tuple=(1600, 200, 1), output_shape :tuple=(200, 1428)) -> None:
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super().__init__()
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self.input_shape = input_shape
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self.output_shape = output_shape
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self._model_name = 'SpeechModel251'
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self.model, self.model_base = self._define_model(self.input_shape, self.output_shape[1])
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def _define_model(self, input_shape, output_size) -> tuple:
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label_max_string_length = 64
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input_data = Input(name='the_input', shape=input_shape)
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layer_h1 = Conv2D(32, (3,3), use_bias=False, activation='relu', padding='same', kernel_initializer='he_normal')(input_data) # 卷积层
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layer_h1 = Dropout(0.05)(layer_h1)
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layer_h2 = Conv2D(32, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h1) # 卷积层
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layer_h3 = MaxPooling2D(pool_size=2, strides=None, padding="valid")(layer_h2) # 池化层
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#layer_h3 = Dropout(0.2)(layer_h2) # 随机中断部分神经网络连接，防止过拟合
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layer_h3 = Dropout(0.05)(layer_h3)
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layer_h4 = Conv2D(64, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h3) # 卷积层
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layer_h4 = Dropout(0.1)(layer_h4)
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layer_h5 = Conv2D(64, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h4) # 卷积层
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layer_h6 = MaxPooling2D(pool_size=2, strides=None, padding="valid")(layer_h5) # 池化层
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layer_h6 = Dropout(0.1)(layer_h6)
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layer_h7 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h6) # 卷积层
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layer_h7 = Dropout(0.15)(layer_h7)
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layer_h8 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h7) # 卷积层
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layer_h9 = MaxPooling2D(pool_size=2, strides=None, padding="valid")(layer_h8) # 池化层
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layer_h9 = Dropout(0.15)(layer_h9)
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layer_h10 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h9) # 卷积层
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layer_h10 = Dropout(0.2)(layer_h10)
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layer_h11 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h10) # 卷积层
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layer_h12 = MaxPooling2D(pool_size=1, strides=None, padding="valid")(layer_h11) # 池化层
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layer_h12 = Dropout(0.2)(layer_h12)
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layer_h13 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h12) # 卷积层
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layer_h13 = Dropout(0.2)(layer_h13)
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layer_h14 = Conv2D(128, (3,3), use_bias=True, activation='relu', padding='same', kernel_initializer='he_normal')(layer_h13) # 卷积层
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layer_h15 = MaxPooling2D(pool_size=1, strides=None, padding="valid")(layer_h14) # 池化层
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#test=Model(inputs = input_data, outputs = layer_h12)
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#test.summary()
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layer_h16 = Reshape((200, 3200))(layer_h15) #Reshape层
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#layer_h6 = Dropout(0.2)(layer_h5) # 随机中断部分神经网络连接，防止过拟合
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layer_h16 = Dropout(0.3)(layer_h16)
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layer_h17 = Dense(128, activation="relu", use_bias=True, kernel_initializer='he_normal')(layer_h16) # 全连接层
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layer_h17 = Dropout(0.3)(layer_h17)
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layer_h18 = Dense(output_size, use_bias=True, kernel_initializer='he_normal')(layer_h17) # 全连接层
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y_pred = Activation('softmax', name='Activation0')(layer_h18)
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model_base = Model(inputs = input_data, outputs = y_pred)
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#model_data.summary()
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labels = Input(name='the_labels', shape=[label_max_string_length], dtype='float32')
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input_length = Input(name='input_length', shape=[1], dtype='int64')
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label_length = Input(name='label_length', shape=[1], dtype='int64')
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# Keras doesn't currently support loss funcs with extra parameters
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# so CTC loss is implemented in a lambda layer
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loss_out = Lambda(ctc_lambda_func, output_shape=(1,), name='ctc')([y_pred, labels, input_length, label_length])
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model = Model(inputs=[input_data, labels, input_length, label_length], outputs=loss_out)
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return model, model_base
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def get_model(self) -> tuple:
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return self.model, self.model_base
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def get_train_model(self) -> Model:
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return self.model
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def get_eval_model(self) -> Model:
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return self.model_base
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def summary(self) -> None:
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self.model.summary()
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def get_model_name(self) -> str:
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return self._model_name
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def load_weights(self, filename :str) -> None:
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self.model.load_weights(filename)
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def save_weights(self, filename :str) -> None:
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self.model.save_weights(filename + '.model')
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self.model_base.save_weights(filename + '.model.base')
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# 需要安装 hdf5 模块
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self.model.save(filename + '.h5')
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self.model_base.save(filename + '.base.h5')
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f = open('epoch_'+self._model_name+'.txt','w')
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f.write(filename)
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f.close()
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def get_loss_function(self) -> dict:
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return {'ctc': lambda y_true, y_pred: y_pred}
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