In Tensorflow it can be done the following way:
import tensorflow.keras.backend as K
import numpy as np
a = np.array([1,2,3])
b = K.constant(a)
print(b)
# <tf.Tensor 'Const_1:0' shape=(3,) dtype=float32>
print(K.eval(b))
# array([1., 2., 3.], dtype=float32)
In raw keras it should be done replacing import tensorflow.keras.backend as K
with from keras import backend as K
.
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