我是TensorFlow hub的新手,我正在尝试使用Conv1D网络中的hub嵌入层进行文本分类
在顺序模型中使用集线器嵌入层没有任何问题:
hub_layer = hub.KerasLayer("https://tfhub.dev/google/nnlm-en-dim50/2",
input_shape=[], dtype=tf.string, trainable=False)
model = tf.keras.Sequential()
model.add(hub_layer)
model.add(tf.keras.layers.Dense(128))
model.add(tf.keras.layers.Activation('relu'))
model.add(tf.keras.layers.Dense(5))
model.add(tf.keras.layers.Activation('softmax'))
model.compile(loss="categorical_crossentropy", optimizer="adam", metrics=["accuracy"])
model.summary()
但是,我无法在Conv1D模型中使用:
第一款:
int_sequences_input = Input(shape=(max_length,))
embedded_sequences = hub_layer(int_sequences_input)
x = layers.Conv1D(128, 5, activation="relu")(embedded_sequences)
x = layers.MaxPooling1D(5)(x)
x = layers.Conv1D(128, 5, activation="relu")(x)
x = layers.GlobalMaxPooling1D()(x)
x = layers.Dense(128, activation="relu")(x)
x = layers.Dropout(0.5)(x)
preds = layers.Dense(len(class_names), activation="softmax")(x)
model = keras.Model(int_sequences_input, preds)
model.summary()
或:
第二种模式:
model = tf.keras.Sequential()
model.add(hub_layer)
model.add(tf.keras.layers.Conv1D(128, 7, activation='relu'))
model.add(tf.keras.layers.GlobalMaxPooling1D())
model.add(tf.keras.layers.Dense(64, activation='relu'))
model.add(tf.keras.layers.Dense(num_classes, activation='softmax'))
model.compile(optimizer='adam',
loss='categorical_crossentropy',
metrics=['accuracy'])
model.summary()
因为我得到的值错误为:
ValueError: Input 0 of layer conv1d_11 is incompatible with the layer: expected ndim=3, found ndim=2. Full shape received: [None, 50]
我想知道有没有解决办法? 我调查了{a1}或{a2},但没有一个能解决我的问题
生成的嵌入维度是:
(num_examples, embedding_dimension)
,这与1D卷积不兼容,因为它需要3D输入尝试在轮毂层之后重塑形状,如下所示:
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