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[英]Getting the "ValueError: Shapes (64, 4) and (64, 10) are incompatible" when trying to fit my model
[英]I keep getting ValueError: Shapes (10, 1) and (10, 3) are incompatible when training my model
當我調用 makeModel 時,將輸入數量從 3 變為 1 可以讓程序無錯誤地運行,但實際上沒有進行任何訓練,並且准確性不會改變。
import pandas as pd
from numpy import loadtxt
from sklearn.impute import SimpleImputer
from sklearn.model_selection import train_test_split
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense
from sklearn.preprocessing import LabelEncoder
from sklearn.utils import shuffle
from sklearn.tree import DecisionTreeRegressor as dtr
from sklearn.metrics import mean_absolute_error as mae
import numpy as np
def makeModel(num_inputs, num_classes, train_X, train_y):
model = Sequential()
model.add(Dense(8, input_dim=num_inputs, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(3, activation='softmax'))
model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
model.fit(train_X, train_y, epochs=10, batch_size=10)
return model
label_encoder = LabelEncoder()
iris_data = pd.read_csv("iris.csv")
iris_data = shuffle(iris_data)
iris_data['species'] = label_encoder.fit_transform(iris_data['species'])
feature_columns = ['sepal_length', 'sepal_width', 'petal_length', 'petal_width']
X = iris_data[feature_columns]
y = iris_data['species']
train_x, val_x, train_y, val_y = train_test_split(X, y, test_size=0.2)
iris_model = makeModel(4, 3, train_x, train_y)
LabelEncoder
將輸入轉換為編碼值數組。 即,如果您的輸入是["paris", "paris", "tokyo", "amsterdam"]
那么它們可以編碼為[0, 0, 1, 2]
。 它不是categorical_crossentropy
損失所期望的 one-hot 編碼方案。 如果您有 integer 編碼,則必須使用sparse_categorical_crossentropy
將您的代碼丟失更改為sparse_categorical_crossentropy
:
model.compile(loss='sparse_categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
def makeModel(num_inputs, num_classes, train_X, train_y):
model = Sequential()
model.add(Dense(8, input_dim=num_inputs, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(10, activation='relu'))
model.add(Dense(3, activation='softmax'))
model.compile(loss='sparse_categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
model.fit(train_X, train_y, epochs=10, batch_size=10)
return model
label_encoder = LabelEncoder()
iris = datasets.load_iris()
y = iris.target
y = label_encoder.fit_transform(y)
train_x, val_x, train_y, val_y = train_test_split(iris.data, y, test_size=0.2)
iris_model = makeModel(4, 3, train_x, train_y)
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