Concatenate tensors with different shapes in tensorflow

user_19579824 0
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I am new to tensorflow and I'm trying to concatenate 2 tensors with different shapes. The tensors have shape:

>>> a
# <tf.Tensor: id=38, shape=(30000, 943, 1), dtype=float64

>>> b
<tf.Tensor: id=2, shape=(30000, 260, 1), dtype=float64

Is it possible to concatenate them on axis=0 to obtain a tensor with shape (60000, ?, 1)? I tried to convert them to ragged tensors before concatenating:

a2 = tf.ragged.constant(a)
b2 = tf.ragged.constant(b)

c = tf.concat([a2, b2], axis=0)

but it did not work.

tensor tensorflow concatenation shapes python
2 Answers

Try using tf.ragged.stack and merge_dims without converting them to ragged tensors:

import tensorflow as tf

a2 = tf.random.normal((10, 943, 1))
b2 = tf.random.normal((10, 260, 1))

c = tf.ragged.stack([a2, b2], axis=0).merge_dims(0, 1)
print(c.shape)

# (20, None, 1)
user_96578610

You can convert the tensor to RaggedTensor then use your own code (tf.concat).

a = tf.random.uniform((30000, 943, 1), maxval=4, dtype=tf.int32)
b = tf.random.uniform((30000, 260, 1), maxval=4, dtype=tf.int32)

rag_a = tf.RaggedTensor.from_tensor(a)
rag_b = tf.RaggedTensor.from_tensor(b)

res = tf.concat([rag_a, rag_b], axis=0)
print(res.shape)

(60000, None, 1)
user_17405770
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