File Task

task task

The File Task validates a file exists. It handles both file paths and local file urls. Note that this task only works with local files.

Example

The following shows a simple example using this task as part of a workflow.

  1. from txtai.workflow import FileTask, Workflow
  2. workflow = Workflow([FileTask()])
  3. workflow(["/path/to/file", "file:///path/to/file"])

Configuration-driven example

This task can also be created with workflow configuration.

  1. workflow:
  2. tasks:
  3. - task: file

Methods

Python documentation for the task.

__init__(action=None, select=None, unpack=True, column=None, merge='hstack', initialize=None, finalize=None, concurrency=None, onetomany=True, **kwargs)

Creates a new task. A task defines two methods, type of data it accepts and the action to execute for each data element. Action is a callable function or list of callable functions.

Parameters:

NameTypeDescriptionDefault
action

action(s) to execute on each data element

None
select

filter(s) used to select data to process

None
unpack

if data elements should be unpacked or unwrapped from (id, data, tag) tuples

True
column

column index to select if element is a tuple, defaults to all

None
merge

merge mode for joining multi-action outputs, defaults to hstack

‘hstack’
initialize

action to execute before processing

None
finalize

action to execute after processing

None
concurrency

sets concurrency method when execute instance available valid values: “thread” for thread-based concurrency, “process” for process-based concurrency

None
onetomany

if one-to-many data transformations should be enabled, defaults to True

True
kwargs

additional keyword arguments

{}

Source code in txtai/workflow/task/base.py

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  1. def init(
  2. self,
  3. action=None,
  4. select=None,
  5. unpack=True,
  6. column=None,
  7. merge=”hstack”,
  8. initialize=None,
  9. finalize=None,
  10. concurrency=None,
  11. onetomany=True,
  12. kwargs,
  13. ):
  14. “””
  15. Creates a new task. A task defines two methods, type of data it accepts and the action to execute
  16. for each data element. Action is a callable function or list of callable functions.
  17. Args:
  18. action: action(s) to execute on each data element
  19. select: filter(s) used to select data to process
  20. unpack: if data elements should be unpacked or unwrapped from (id, data, tag) tuples
  21. column: column index to select if element is a tuple, defaults to all
  22. merge: merge mode for joining multi-action outputs, defaults to hstack
  23. initialize: action to execute before processing
  24. finalize: action to execute after processing
  25. concurrency: sets concurrency method when execute instance available
  26. valid values: thread for thread-based concurrency, process for process-based concurrency
  27. onetomany: if one-to-many data transformations should be enabled, defaults to True
  28. kwargs: additional keyword arguments
  29. “””
  30. # Standardize into list of actions
  31. if not action:
  32. action = []
  33. elif not isinstance(action, list):
  34. action = [action]
  35. self.action = action
  36. self.select = select
  37. self.unpack = unpack
  38. self.column = column
  39. self.merge = merge
  40. self.initialize = initialize
  41. self.finalize = finalize
  42. self.concurrency = concurrency
  43. self.onetomany = onetomany
  44. # Check for custom registration. Adds additional instance members and validates required dependencies available.
  45. if hasattr(self, register”):
  46. self.register(kwargs)
  47. elif kwargs:
  48. # Raise error if additional keyword arguments passed in without register method
  49. kwargs = “, “.join(f”‘{kw}’” for kw in kwargs)
  50. raise TypeError(finit() got unexpected keyword arguments: {kwargs}”)