Conv1D for classify non-image dataset show error ValueError : `logits` and `labels` must have the sa-CodePudding

I found this paper they present Convolutional Neural Network can get the best accuracy for non-image classify. So, I want to use CNN with non-image dataset. I download Early Stage Diabetes Risk Prediction Dataset form kaggle. I create CNN moldel like this code.

dataset = loadtxt('diabetes_data_upload.csv', delimiter=',')
# split into input (X) and output (y) variables
X = dataset[:,0:16]
Y = dataset[:,16]

X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=0.3)

model = Sequential()
model.add(Conv1D(16,2, activation='relu', input_shape=(16, 1)))
model.add(Dense(1, activation='sigmoid'))
model.compile(loss='binary_crossentropy', optimizer='adam', metrics=['accuracy'])
model.fit(X_train, y_train, epochs=100, batch_size=10)

It show error like this.

ValueError: `logits` and `labels` must have the same shape, received ((None, 15, 1) vs (None,)).

How to fix it ?

CodePudding user response：

You can use tf.keras.layers.Flatten(). Something like below can solve youe problem.

from sklearn.model_selection import train_test_split
import tensorflow as tf
import numpy as np


X = np.random.rand(100, 16)
Y = np.random.randint(0,2, size = 100) # <- Because you have two labels, I generate ranom 0,1

X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=0.3)

model = tf.keras.Sequential()
model.add(tf.keras.layers.Conv1D(16,2, activation='relu', input_shape=(16, 1)))
model.add(tf.keras.layers.Flatten())
model.add(tf.keras.layers.Dense(1, activation='sigmoid'))
model.compile(loss='binary_crossentropy', optimizer='adam', metrics=['accuracy'])
model.fit(X_train, y_train, epochs=1, batch_size=10)

Update by thanks Ameya, we can solve this problem by only using tf.keras.layers.GlobalAveragePooling1D() too.

(by thanks Djinn and his_comment, but consider: these are two different approaches that do different things. Flatten() preserves all data, and just converts input tensors to a 1D tensor BUT GlobalAveragePooling1D() tries to generalize and loses data. Pooling layers with non-image data can significantly affect performance but I've noticed AveragePooling does the least "damage,")

model = tf.keras.Sequential()
model.add(tf.keras.layers.Conv1D(16,2, activation='relu', input_shape=(16, 1)))
model.add(tf.keras.layers.GlobalAveragePooling1D())
model.add(tf.keras.layers.Dense(1, activation='sigmoid'))

7/7 [==============================] - 0s 2ms/step - loss: 0.6954 - accuracy: 0.0000e 00