'Life of Pi' is an American survival drama film, based on the novel of same name. The story involves 227 days that its teenage hero Pi Patel spends drifting across the Pacific Ocean in a lifeboat with a Bengal tiger. The heart of the film focuses on the sea journey, during which the human demonstrates that he can think with great ingenuity and tiger shows that it can learn. The movie emerged as a critical and commercial success and also won many prestigious awards.Who wrote the novel 'Life of Pi' on which the film is based?