[WebGL backend] fix tf.concat for inputs of one tensor #6930
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Fix #6884
When

tf.concat
's input size is one, tfjs's WebGL backend should clone and return a same tensor as TensorFlow:However, tfjs' WebGL backend throughs an error, because concatImpl could not handle
inputs.length === 1
:(failed to run
ConcatProgram
)To see the logs from the Cloud Build CI, please join either our discussion or announcement mailing list.
This change is