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def mean(values): return sum(values) / len(values)

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def mean(values): return sum(values) / len(values) def average(numbers): avg = sum(numbers) N = len(numbers) return avg / N

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def mean(values): return sum(values) / len(values) def average(numbers): avg = sum(numbers) N = len(numbers) return avg / N >>> mean([]) Traceback (most recent call last): File "", line 1, in File "", line 2, in mean ZeroDivisionError: integer division or modulo by zero

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while block while block block if CODE AST AST KERNEL block while block if block block while A. Corazza, S. Di Martino, V. Maggio and G. Scanniello A Tree Kernel based approach for clone detection, ICSM 2010

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map(k1, v1) -> list((k2, v2)) • •

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map(k1, v1) -> list((k2, v2)) • • reduce(k2, list(v2)) -> list(v3) • •

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e applicazione

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e applicazione

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Abstract Syntax Tree (AST) Tree structure representing the syntactic structure of the different instructions of a program (function) Computation of the dot product between (Graph) Structures K( ) ,