ValueError Input 0 of layer sequential_1 is incompatible with the layer expected shape=None 1 1 found shape=None 3

The error message suggests that there is an incompatibility between the input shape expected by the model and the actual shape of the input data.

In this case, the model expects an input shape of (None, 1, 1), but the actual input data has a shape of (None, 3).

To resolve this issue, you can reshape your input data to match the expected shape. One way to do this is by using the numpy library:

import numpy as np

# Assuming 'x' is your input data with shape (None, 3)
x_reshaped = np.reshape(x, (x.shape[0], 1, 1))

# Now 'x_reshaped' will have shape (None, 1, 1) which is compatible with the model

Alternatively, you can modify your model architecture to accept input data with shape (None, 3) instead. This can be done by changing the input shape of the first layer in your model. For example:

from tensorflow.keras import layers, models

model = models.Sequential()
model.add(layers.Dense(16, activation='relu', input_shape=(3,)))  # Modify the input shape

# Rest of your model architecture

Make sure to adjust the input shape of the subsequent layers in your model accordingly