# nvidia.dali.fn.cat¶

nvidia.dali.fn.cat(*inputs, **kwargs)

Joins the input tensors along an existing axis.

The shapes of the inputs must match in all dimensions except the concatenation axis.

Supported backends
• ‘cpu’

• ‘gpu’

Parameters
• input0 (TensorList) – Input to the operator.

• input[1..998] (TensorList, optional) – This function accepts up to 998 optional positional inputs

Keyword Arguments
• axis (int, optional, default = 0) – Axis along which the input tensors are concatenated.

• axis_name (str, optional) –

Name of the axis along which the tensors are concatenated.

This argument is mutually exclusive with axis. This argument requires that at least one input has a non-empty layout and that all non-empty input layouts match.

• bytes_per_sample_hint (int or list of int, optional, default = [0]) –

Output size hint, in bytes per sample.

If specified, the operator’s outputs residing in GPU or page-locked host memory will be preallocated to accommodate a batch of samples of this size.

• preserve (bool, optional, default = False) – Prevents the operator from being removed from the graph even if its outputs are not used.

• seed (int, optional, default = -1) –

Random seed.

If not provided, it will be populated based on the global seed of the pipeline.