According to [this thread](https://groups.google.com/d/topic/pylearn-dev/SqszNmd6sfI/discussion), "tensor_like" was meant to mean "either a float, or a numpy array or a theano variable", like NumPy uses "array_like" in the documentation to denote a variety of things that can be converted into an array.
Do you have an idea where that definition should be properly stated?