tf.keras.backend.ndim

TensorFlow 2 version

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

tf.keras.backend.ndim(
    x
)

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