Utils

data_utils

This file contains functions related to data utility.

scalr.utils.data_utils.generate_dummy_anndata(n_samples, n_features, target_name='celltype')

This function returns anndata object of shape (n_samples, n_features).

It generates random values for target, batch & env from below mentioned choices. If you require more columns, you can add them in the below adata.obs without editing already existing columns.

Parameters:

• n_samples – Number of samples in anndata.

• n_features – Number of features in anndata.

• target_name – Any preferred target name. Default is celltype.

Returns:

Anndata object.

scalr.utils.data_utils.get_one_hot_matrix(data: array)

This function returns a one-hot matrix of given labels.

Parameters:

data – Categorical data of dim 1D or 2D array.

Returns:

one-hot matrix.

scalr.utils.data_utils.get_random_samples(data: AnnData | AnnCollection, n_random_samples: int) → tensor

This function returns random N samples from given data.

Parameters:

• data – AnnData or AnnCollection object.

• n_random_samples – number of random samples to extract from the data.

Returns:

Chosen random samples tensor.

file_utils

This file contains functions related to file read-write.

scalr.utils.file_utils.dump_anndata(adata: AnnData, filepath: str)

This function writes the AnnData to filepath.

scalr.utils.file_utils.dump_csv(df: DataFrame, filepath: str)

This function stores the config file to filepath.

scalr.utils.file_utils.dump_json(config: dict, filepath: str)

This function stores the json file to filepath.

scalr.utils.file_utils.dump_yaml(config: dict, filepath: str)

This function stores the config file to filepath.

scalr.utils.file_utils.load_test_data_from_config(data_config)

This function returns test data from the data config.

Parameters:

data_config – Data config.

scalr.utils.file_utils.load_train_val_data_from_config(data_config)

This function returns train & validation data from the data config.

Parameters:

data_config – Data config.

scalr.utils.file_utils.read_anndata(filepath: str, backed: str = 'r') → AnnData

This file returns the Anndata object from filepath.

scalr.utils.file_utils.read_chunked_anndatas(dirpath: str, backed: str = 'r') → AnnCollection

This file returns an AnnCollection object from multiple anndatas in dirpath directory.

scalr.utils.file_utils.read_csv(filepath: str, index_col: int = 0) → DataFrame

This file returns the DataFrame file object.

scalr.utils.file_utils.read_data(filepath: str, backed: str = 'r', index_col: int = 0) → dict | AnnData | AnnCollection

This function reads a json, yaml, csv or AnnData object file if the file path contains it.

Returns an AnnCollection in case of a directory with chunked anndatas.

Parameters:

• filepath (str) – path to json, yaml or h5ad file. Or directory containing multiple h5ad files.

• backed (str, optional) – To load AnnData / AnnCollection in backed mode. Defaults to ‘r’.

Raises:

ValueError – In case of the wrong file path provided.

Returns:

Union[dict, AnnData, AnnCollection].

scalr.utils.file_utils.read_json(filepath: str) → dict

This file returns the json file object.

scalr.utils.file_utils.read_yaml(filepath: str) → dict

This function returns the config file loaded from yaml.

scalr.utils.file_utils.write_chunkwise_data(full_data: AnnData | AnnCollection, sample_chunksize: int, dirpath: str, sample_inds: list[int] | None = None, feature_inds: list[int] | None = None, transform=None)

This function writes data subsets iteratively in a chunkwise manner, to ensure only at most sample_chunksize samples are loaded at a time.

This function can also apply transformation on each chunk.

Parameters:

• full_data (Union[AnnData, AnnCollection]) – data to be written in chunks.

• sample_chunksize (int) – number of samples to be loaded at a time.

• dirpath (str) – path/to/directory to write the chunks of data.

• sample_inds (list[int], optional) – To be used in case of chunking only a subset of samples. Defaults to all samples.

• feature_inds (list[int], optional) – To be used in case of writing only a subset of features.dataframe. Defaults to all features.

• transform (function) – a function to apply a transformation on a chunked numpy array.

scalr.utils.file_utils.write_data(data: dict | AnnData | DataFrame, filepath: str)

This function writes data to json, yaml, csv or h5ad file.

logger

This file contains an implementation of the logger in the pipeline.

class scalr.utils.logger.EventLogger(name, level=None, filepath=None, stdout=False)

Bases: Logger

Class for event logger. It logs detailed file-level logs during pipeline execution.

filepath = None

heading(msg, prefix, suffix, count)

A function to configure setting for heading.

heading1(msg)

A function to configure setting for heading 1.

heading2(msg)

A function to configure setting for heading 2.

level = 0

class scalr.utils.logger.FlowLogger(name, level=None)

Bases: Logger

Class for flow logger.

It logs high-level overview of pipeline execution in the terminal.

level = 0

misc_utils

This file contains functions related to miscellaneous utilities.

scalr.utils.misc_utils.build_object(module, config: dict)

A builder function to build an object from its config.

Parameters:

• module – Module containing the class.

• config – Contains the name of the class and params to initialize the object.

Returns: Object, updated config.

scalr.utils.misc_utils.overwrite_default(user_config: dict, default_config: dict) → dict

The function recursively overwrites information from user_config onto the default_config.

scalr.utils.misc_utils.set_seed(seed: int)

A function to set seed for reproducibility.

test_file_utils

This is a test file for file_utils.py

scalr.utils.test_file_utils.test_write_chunkwise_data()

This function tests write_chunkwise(), write_data() & read_data() functions of file_utils.

test_misc_utils

This is a test file for misc_utils.py

scalr.utils.test_misc_utils.test_overwrite_default()

This funciton tests overwrite_default() function of misc_utils.