tf.keras.backend.ndim

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Returns the number of axes in a tensor, as an integer.

Arguments
x Tensor or variable.
Returns
Integer (scalar), number of axes.

Examples:

from keras import backend as K
input = K.placeholder(shape=(2, 4, 5))
val = np.array([[1, 2], [3, 4]])
kvar = K.variable(value=val)
K.ndim(input)
3
K.ndim(kvar)
2

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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/keras/backend/ndim