FICTION: It's stated on the end credits.
We all get confused with the publicity, saying "based on the true accounts".
Yes, this movie it's based on a book, but it clearly states the following, at the end of the credits:
"This is a work of fiction. The characters, incidents, and locations portrayed and the names herein are fictitious, and any similarity to or identification with the location, name, character or history of any person, product or entity is entirely coincidental and unintentional."
FICTION 200%
Please excuse my terrible redaction, english is not my native language.