ValueError: Error when checking input: expected dense_1_input to have shape (180,) but got array with shape (1,)

Question

My learning model is as follows (using Keras).

model = Sequential()
model.add(Dense(100, activation='relu', input_shape = (X_train.shape[0],)))
model.add(Dense(500, activation='relu'))
model.add(Dense(2, activation='softmax'))

My input data X_train is an array of shape (180,) and the corresponding y_train containing labels is also an array of shape (180,). I tried to compile and fit the model as follows.

model.compile(loss="sparse_categorical_crossentropy",
             optimizer="adam",
             metrics=['accuracy'])

model.fit(X_train, y_train, epochs = 200)

When I run the model.fit(), I encountered the following error:

ValueError: Error when checking input: expected dense_1_input to have
shape (180,) but got array with shape (1,)

I'm not sure what I'm doing wrong since I'm pretty new to deep learning. Any help is appreciated. Thanks.

what is the size of X_train

Shubham Shaswat
– Shubham Shaswat

2020-02-14 12:51:38 +00:00
Commented Feb 14, 2020 at 12:51 — Shubham Shaswat
– Shubham Shaswat, Commented Feb 14, 2020 at 12:51
@ShubhamShaswat 180

Danush Aaditya
– Danush Aaditya

2020-02-14 12:57:04 +00:00
Commented Feb 14, 2020 at 12:57 — Danush Aaditya
– Danush Aaditya, Commented Feb 14, 2020 at 12:57

Thomas Schillaci · Accepted Answer · 2020-02-14 13:07:06Z

1

In your case, the input_shape defined in the first layer, should be (1,):

X_train.shape[0] is the number of samples, each sample has for shape (1,).

Moreover, your call to the fit function won't work as your output has for shape (2,) (Dense(2)) whereas the shape of each target sample is (1,) (you have 180 of those).

edited Feb 14, 2020 at 13:07

answered Feb 14, 2020 at 12:41

Thomas Schillaci

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Comments

Gabriele Valvo · Accepted Answer · 2020-02-14 13:18:14Z

0

As @Thomas Schillaci wrote, the problem is that if you write X_train.shape[0] you are taking into account the number of samples of your dataset. But in that line the code want to know how many features you have, so you have to change in X_train.shape[1] in order to have the n° of input. How many labels do you have?

answered Feb 14, 2020 at 13:18

Gabriele Valvo

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