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[英]“ValueError: …incompatible with the layer: expected axis -1 of input shape to have value 8 but received input with shape (None, 7, 169)”
[英]ValueError: expected axis -1 of input shape to have value 51948 but received input with shape (None, 52)
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
from sklearn.model_selection import train_test_split
import tensorflow.keras as keras
dataset = pd.read_csv('C:\\Users\\Maxie\\MyStuff\\FinalDatasetEng.csv')
inputs = dataset.iloc[:, 2:54].values
targets = dataset.iloc[:, 55].values
from sklearn.model_selection import train_test_split
inputs_train, inputs_test, targets_train, targets_test = train_test_split(inputs, targets,
test_size = 0.20, random_state = 0)
import keras
from keras.models import Sequential
from keras.layers import Dense
model = keras.Sequential([
# input layer
keras.layers.Flatten(input_shape=(inputs.shape[0], inputs.shape[1])),
# 1st dense layer
keras.layers.Dense(520, activation='relu'),
# 2nd dense layer
keras.layers.Dense(208, activation='relu'),
# 3rd dense layer
keras.layers.Dense(52, activation='relu'),
# output layer
keras.layers.Dense(4, activation='softmax')
])
optimiser = keras.optimizers.Adam(learning_rate=0.0001)
model.compile(optimizer=optimiser,
loss='sparse_categorical_crossentropy',
metrics=['accuracy'])
history = model.fit(inputs_train, targets_train, validation_data=(inputs_test, targets_test),
batch_size=32, epochs=50)
這是我的代碼,我收到此錯誤:ValueError:dense_20 層的輸入 0 與該層不兼容:輸入形狀的預期軸 -1 具有值 51948,但接收到形狀的輸入(無,52)。 任何人都請幫我解決這個問題。
您有一個一維數組作為您的特征輸入,但是您將樣本數量和特征數量展平,從而提供 model 51948 個輸入特征(999 個樣本input.shape[0]
* 52 個特征input.shape[1]
= 51948)。 因此,您的 model 需要一個包含 51948 個輸入的數組,但您已經傳遞了具有 52 列的inputs_train
。
推理:
如果您將一維數組作為輸入要素,則不應展平您的輸入。 您的輸入特征是 52 列和 999 個樣本的數組。 代替Flatten
層,使用InputLayer
。
所以,修改后的代碼應該是這樣的:
model = keras.Sequential([
# input layer
#change this line to input layer and set the input shape to the shape of your input features
#keras.layers.Flatten(input_shape=(inputs.shape[0], inputs.shape[1])),
keras.layers.InputLayer(input_shape=(inputs.shape[1],)),
# 1st dense layer
keras.layers.Dense(520, activation='relu'),
# 2nd dense layer
keras.layers.Dense(208, activation='relu'),
# 3rd dense layer
keras.layers.Dense(52, activation='relu'),
# output layer
keras.layers.Dense(4, activation='softmax')
])
optimiser = keras.optimizers.Adam(learning_rate=0.0001)
model.compile(optimizer=optimiser,
loss='sparse_categorical_crossentropy',
metrics=['accuracy'])
history = model.fit(inputs_train, targets_train, validation_data=(inputs_test, targets_test),
batch_size=32, epochs=50)
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