one.alf.io

I/O functions for ALyx Files.

Provides support for time-series reading and interpolation as per the specifications For a full overview of the scope of the format, see:

https://int-brain-lab.github.io/ONE/alf_intro.html

Functions

check_dimensions	Test for consistency of dimensions as per ALF specs in a dictionary.
dataframe	Converts an Bunch conforming to size conventions into a pandas DataFrame.
exists	Test if ALF object and optionally specific attributes exist in the given path
filter_by	Given a path and optional filters, returns all ALF files and their associated parts.
iter_datasets	Iterate over all files in a session, and yield relative dataset paths.
iter_sessions	Recursively iterate over session paths in a given directory.
load_file_content	Returns content of files.
load_object	Reads all files sharing the same object name.
next_num_folder	Return the next number for a session given a session_date_folder.
read_ts	Load time-series from ALF format
remove_empty_folders	Iteratively remove any empty child folders.
remove_uuid_file	(DEPRECATED) Renames a file without the UUID and returns the new pathlib.Path object.
remove_uuid_recursive	(DEPRECATED) Within a folder, recursive renaming of all files to remove UUID.
save_metadata	Writes a meta data file matching a current ALF file object.
save_object_npy	Saves a dictionary in ALF format using object as object name and dictionary keys as attribute names.
ts2vec	Interpolate a continuous timeseries of the shape (2, 2)

Classes

AlfBunch

A dict-like object that supports dot indexing and conversion to DataFrame

class AlfBunch(*args, **kwargs)

Bases: Bunch

A dict-like object that supports dot indexing and conversion to DataFrame

property check_dimensions

0 for consistent dimensions, 1 for inconsistent dimensions

Type:

int

append(b, inplace=False)

Appends one bunch to another, key by key

Parameters:

• b (Bunch, dict) – A Bunch of data to append

• inplace (bool) – If true, the data are appended in place, otherwise a copy is returned

Returns:

An ALFBunch with the data appended, or None if inplace is True

Return type:

ALFBunch, None

to_df() → DataFrame

Return DataFrame with data keys as columns

static from_df(df) → AlfBunch

dataframe(adict)

Converts an Bunch conforming to size conventions into a pandas DataFrame. For 2-D arrays, stops at 10 columns per attribute.

Parameters:

adict (dict, Bunch) – A dict-like object of data to convert to DataFrame

Returns:

A pandas DataFrame of data

Return type:

pd.DataFrame

read_ts(filename)

Load time-series from ALF format

Parameters:

filename (str, pathlib.Path) – An ALF path whose values to load

Returns:

• numpy.ndarray – An array of timestamps belonging to the ALF path object

• numpy.ndarray – An array of values in filename

Examples

>>> t, d = read_ts(filename)

ts2vec(ts: ndarray, n_samples: int) → ndarray

Interpolate a continuous timeseries of the shape (2, 2)

Parameters:

• ts (numpy.array) – a 2x2 numpy array of the form (sample, ts)

• n_samples (int) – Number of samples; i.e. the size of the resulting vector

Returns:

A vector of interpolated timestamps

Return type:

numpy.ndarray

check_dimensions(dico)

Test for consistency of dimensions as per ALF specs in a dictionary.

Alf broadcasting rules: only accepts consistent dimensions for a given axis a dimension is consistent with another if it’s empty, 1, or equal to the other arrays dims [a, 1], [1, b] and [a, b] are all consistent, [c, 1] is not

Parameters:

dico (ALFBunch, dict) – Dictionary containing data

Returns:

Status 0 for consistent dimensions, 1 for inconsistent dimensions

Return type:

int

load_file_content(fil)

Returns content of files. Designed for very generic file formats: so far supported contents are json, npy, csv, (h)tsv, ssv, jsonable

Parameters:

fil (str, pathlib.Path) – File to read

Returns:

Array/json/pandas dataframe depending on format

Return type:

Any

iter_sessions(root_dir, pattern='*')

Recursively iterate over session paths in a given directory.

Parameters:

• root_dir (str, pathlib.Path) – The folder to look for sessions.

• pattern (str) – Glob pattern to use. Default searches all folders. Providing a more specific pattern makes this more performant (see examples).

Yields:

pathlib.Path – The next session path in lexicographical order.

Examples

Efficient iteration when root_dir contains <lab>/Subjects folders

>>> sessions = list(iter_sessions(root_dir, pattern='*/Subjects/*/????-??-??/*'))

Efficient iteration when root_dir contains subject folders

>>> sessions = list(iter_sessions(root_dir, pattern='*/????-??-??/*'))

iter_datasets(session_path)

Iterate over all files in a session, and yield relative dataset paths.

Parameters:

session_path (str, pathlib.Path) – The folder to look for datasets.

Yields:

pathlib.Path – The next dataset path (relative to the session path) in lexicographical order.

exists(alfpath, object, attributes=None, **kwargs) → bool

Test if ALF object and optionally specific attributes exist in the given path

Parameters:

• alfpath (str, pathlib.Path) – The folder to look into

• object (str) – ALF object name

• attributes (str, list) – Wanted attributes

• wildcards (bool) – If true uses unix shell style pattern matching, otherwise uses regular expressions

• **kwargs – Other ALF parts to filter by

Returns:

For multiple attributes, returns True only if all attributes are found

Return type:

bool

load_object(alfpath, object=None, short_keys=False, **kwargs)

Reads all files sharing the same object name.

For example, if the file provided to the function is spikes.times, the function will load spikes.times, spikes.clusters, spikes.depths, spike.amps in a dictionary whose keys will be times, clusters, depths, amps

Full Reference here: https://int-brain-lab.github.io/ONE/alf_intro.html

Simplified example: _namespace_object.attribute_timescale.part1.part2.extension

Parameters:

• alfpath (str, pathlib.Path, list) – Any ALF path pertaining to the object OR directory containing ALFs OR list of paths.

• object (str, list, None) – The ALF object(s) to filter by. If a directory is provided and object is None, all valid ALF files returned.

• short_keys (bool) – By default, the output dictionary keys will be compounds of attributes, timescale and any eventual parts separated by a dot. Use True to shorten the keys to the attribute and timescale.

• wildcards (bool) – If true uses unix shell style pattern matching, otherwise uses regular expressions.

• **kwargs – Other ALF parts to filter by.

Returns:

An ALFBunch (dict-like) of all attributes pertaining to the object.

Return type:

AlfBunch

Examples

Load ‘spikes’ object

>>> spikes = load_object('full/path/to/my/alffolder/', 'spikes')

Load ‘trials’ object under the ‘ibl’ namespace

>>> trials = load_object('/subject/2021-01-01/001', 'trials', namespace='ibl')

save_object_npy(alfpath, dico, object, parts=None, namespace=None, timescale=None) → list

Saves a dictionary in ALF format using object as object name and dictionary keys as attribute names. Dimensions have to be consistent.

Simplified ALF example: _namespace_object.attribute.part1.part2.extension

Parameters:

• alfpath (str, pathlib.Path) – Path of the folder to save data to

• dico (dict) – Dictionary to save to npy; keys correspond to ALF attributes

• object (str) – Name of the object to save

• parts (str, list, None) – Extra parts to the ALF name

• namespace (str, None) – The optional namespace of the object

• timescale (str, None) – The optional timescale of the object

Returns:

List of written files

Return type:

list

Examples

>>> spikes = {'times': np.arange(50), 'depths': np.random.random(50)}
>>> files = save_object_npy('/path/to/my/alffolder/', spikes, 'spikes')

save_metadata(file_alf, dico) → None

Writes a meta data file matching a current ALF file object.

For example given an alf file clusters.ccfLocation.ssv this will write a dictionary in JSON format in clusters.ccfLocation.metadata.json

Reserved keywords:

• columns: column names for binary tables.

• row: row names for binary tables.

• unit

Parameters:

• file_alf (str, pathlib.Path) – Full path to the alf object

• dico (dict, ALFBunch) – Dictionary containing meta-data

remove_uuid_file(file_path, dry=False) → Path

(DEPRECATED) Renames a file without the UUID and returns the new pathlib.Path object.

Parameters:

• file_path (str, pathlib.Path) – An ALF path containing a UUID in the file name.

• dry (bool) – If False, the file is not renamed on disk.

Returns:

The new file path without the UUID in the file name.

Return type:

pathlib.Path

remove_uuid_recursive(folder, dry=False) → None

(DEPRECATED) Within a folder, recursive renaming of all files to remove UUID.

Parameters:

• folder (str, pathlib.Path) – A folder to recursively iterate, removing UUIDs from the file names.

• dry (bool) – If False renames the files on disk.

next_num_folder(session_date_folder: str | Path) → str

Return the next number for a session given a session_date_folder.

remove_empty_folders(folder: str | Path) → None

Iteratively remove any empty child folders.

filter_by(alf_path, wildcards=True, **kwargs)

Given a path and optional filters, returns all ALF files and their associated parts.

The filters constitute a logical AND. For all but extra, if a list is provided, one or more elements must match (a logical OR).

Parameters:

• alf_path (str, pathlib.Path) – A path to a folder containing ALF datasets

• wildcards (bool) – If true, kwargs are matched as unix-style patterns, otherwise as regular expressions

• object (str, list) – Filter by a given object (e.g. ‘spikes’)

• attribute (str, list) – Filter by a given attribute (e.g. ‘intervals’)

• extension (str, list) – Filter by extension (e.g. ‘npy’)

• namespace (str, list) – Filter by a given namespace (e.g. ‘ibl’) or None for files without one

• timescale (str, list) – Filter by a given timescale (e.g. ‘bpod’) or None for files without one

• extra (str, list) – Filter by extra parameters (e.g. ‘raw’) or None for files without extra parts NB: Wild cards not permitted here.

Returns:

• alf_files (str) – A Path to a directory containing ALF files

• attributes (list of dicts) – A list of parsed file parts

Examples

Filter files with universal timescale

>>> filter_by(alf_path, timescale=None)

Filter files by a given ALF object

>>> filter_by(alf_path, object='wheel')

Filter using wildcard, e.g. ‘wheel’ and ‘wheelMoves’ ALF objects

>>> filter_by(alf_path, object='wh*')

Filter all intervals that are in bpod time

>>> filter_by(alf_path, attribute='intervals', timescale='bpod')

Filter all files containing either ‘intervals’ OR ‘timestamps’ attributes

>>> filter_by(alf_path, attribute=['intervals', 'timestamps'])

Filter all files using a regular expression

>>> filter_by(alf_path, object='^wheel.*', wildcards=False)
>>> filter_by(alf_path, object=['^wheel$', '.*Moves'], wildcards=False)