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# tf.keras.backend.concatenate

Concatenates a list of tensors alongside the specified axis.

`tensors` list of tensors to concatenate.
`axis` concatenation axis.

A tensor.

#### Example:

````a = tf.constant([[1, 2, 3], [4, 5, 6], [7, 8, 9]])`
`b = tf.constant([[10, 20, 30], [40, 50, 60], [70, 80, 90]])`
`tf.keras.backend.concatenate((a, b), axis=-1)`
`<tf.Tensor: shape=(3, 6), dtype=int32, numpy=`
`array([[ 1,  2,  3, 10, 20, 30],`
`       [ 4,  5,  6, 40, 50, 60],`
`       [ 7,  8,  9, 70, 80, 90]], dtype=int32)>`
```
[{ "type": "thumb-down", "id": "missingTheInformationINeed", "label":"Missing the information I need" },{ "type": "thumb-down", "id": "tooComplicatedTooManySteps", "label":"Too complicated / too many steps" },{ "type": "thumb-down", "id": "outOfDate", "label":"Out of date" },{ "type": "thumb-down", "id": "samplesCodeIssue", "label":"Samples / code issue" },{ "type": "thumb-down", "id": "otherDown", "label":"Other" }]
[{ "type": "thumb-up", "id": "easyToUnderstand", "label":"Easy to understand" },{ "type": "thumb-up", "id": "solvedMyProblem", "label":"Solved my problem" },{ "type": "thumb-up", "id": "otherUp", "label":"Other" }]