Based on the outputs from running the function on the inputs "cat," "dog," and "tree," I can see that the function is selectively associating words with a concept. In this case, it seems that the function is associating words related to trees with a higher value closer to 1, while words related to animals have a lower value closer to 0. 

So, the description of the function f(x) could be:
[DESCRIPTION]: The function selectively associates words related to trees with a higher value close to 1, while words related to animals have a lower value close to 0. 

To further validate this description, I will run more tests with different word inputs.

COMMAND: PYTHON(./temp0/function.py car computer flower)