Do parentheses need spaces either side?

I should place parentheses after a space or without any spacing? Which one of below sentences is right?

  1. We adopted DM (Data Mining) in this lecture.
  2. We adopted DM(Data Mining) in this lecture.


The first. Parentheses should have spaces on either side, just like words. For example (taken from The Punctuation Guide):

Parentheses (always used in pairs) allow a writer to provide additional information. The parenthetical material might be a single word, a fragment, or multiple complete sentences.

Source : Link , Question Author : user2991243 , Answer Author : terdon

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