Task Parameters Summary

:numref:task_arguments summarizes all arguments that can be found in the @task decorator.

Table 8 Arguments of the @task decorator

Argument	Value
Formal parameter name	(default: empty)	The parameter is an object or a simple tipe that will be inferred.
	IN	Read-only parameter, all types.
	IN_DELETE	Read-only parameter, all types. Automatic delete after usage.
	INOUT	Read-write parameter, all types except file and primitives.
	OUT	Write-only parameter, all types except file and primitives (requires default constructor).
	CONCURRENT	Concurrent read-write parameter, all types except file and primitives.
	COMMUTATIVE	Commutative read-write parameter, all types except file and primitives.
	FILE(_IN)	Read-only file parameter.
	FILE_INOUT	Read-write file parameter.
	FILE_OUT	Write-only file parameter.
	FILE_CONCURRENT	Concurrent read-write file parameter.
	FILE_COMMUTATIVE	Commutative read-write file parameter.
	DIRECTORY(_IN)	The parameter is a read-only directory.
	DIRECTORY_INOUT	The parameter is a read-write directory.
	DIRECTORY_OUT	the parameter is a write-only directory.
	COLLECTION(_IN)	Read-only collection parameter (list).
	COLLECTION_IN_DELETE	Single usage read-only collection parameter (list).
	COLLECTION_INOUT	Read-write collection parameter (list).
	COLLECTION_OUT	Read-only collection parameter (list).
	COLLECTION_FILE(_IN)	Read-only collection of files parameter (list of files).
	COLLECTION_FILE_INOUT	Read-write collection of files parameter (list of files).
	COLLECTION_FILE_OUT	Read-only collection of files parameter (list of files).
	DICTIONARY(_IN)	Read-only dictionary parameter (dict).
	DICTIONARY_IN_DELETE	Single usage read-only collection dictionary (dict).
	DICTIONARY_INOUT	Read-write dictionary parameter (dict).
	STREAM_IN	The parameter is a read-only stream.
	STREAM_OUT	The parameter is a write-only stream.
	STDIN	The parameter is a file for standard input redirection (only for binaries).
	STDOUT	The parameter is a file for standard output redirection (only for binaries).
	STDERR	The parameter is a file for standard error redirection (only for binaries).
	Explicit: {Type:(empty=object)/FILE/COLLECTION/DICTIONARY, Direction:(empty=IN)/IN/IN_DELETE/INOUT/OUT/CONCURRENT}
returns	Return type or number of returned elements
target_direction	INOUT (default), IN or CONCURRENT
priority	True or False (default)
is_distributed	True or False (default)
is_replicated	True or False (default)
on_failure	’RETRY’ (default), ’CANCEL_SUCCESSORS’, ’FAIL’ or ’IGNORE’
time_out	int (time in seconds)
cache_returns	True or False (default) - Requires to enable the cache
is_reduce	True or False (default)
chunk_size	Reduction chunk size (int)
numba	True or False (default) or mode (string)
numba_flags	Numba flags (dictionary of strings)
numba_signature	Numba signature (list of strings)
numba_declaration	Numba declaration (string)