Table

class Table

The Table class used to display and analyze tabular data.

Unlike traditional spreadsheets, Tables support numerous types of data: scalar values, strings, numpy arrays, and most subclasses of wandb.data_types.Media. This means you can embed Images, Video, Audio, and other sorts of rich, annotated media directly in Tables, alongside other traditional scalar values.

This class is the primary class used to generate the Table Visualizer in the UI: https://docs.wandb.ai/guides/data-vis/tables.

Attributes:

• columns (List[str]): Names of the columns in the table. Defaults to [“Input”, “Output”, “Expected”].
• data: (List[List[any]]) 2D row-oriented array of values.
• dataframe (pandas.DataFrame): DataFrame object used to create the table. When set, data and columns arguments are ignored.
• optional (Union[bool,List[bool]]): Determines if None values are allowed. Default to True. - If a singular bool value, then the optionality is enforced for all columns specified at construction time. - If a list of bool values, then the optionality is applied to each column - should be the same length as columns. applies to all columns. A list of bool values applies to each respective column.
• allow_mixed_types (bool): Determines if columns are allowed to have mixed types (disables type validation). Defaults to False.

method Table.__init__

__init__(
    columns=None,
    data=None,
    rows=None,
    dataframe=None,
    dtype=None,
    optional=True,
    allow_mixed_types=False
)

Initializes a Table object.

The rows is available for legacy reasons and should not be used. The Table class uses data to mimic the Pandas API.

method Table.add_column

add_column(name, data, optional=False)

Adds a column of data to the table.

Args:

• name: (str) - the unique name of the column
• data: (list | np.array) - a column of homogeneous data
• optional: (bool) - if null-like values are permitted

method Table.add_computed_columns

add_computed_columns(fn)

Adds one or more computed columns based on existing data.

Args:

• fn: A function which accepts one or two parameters, ndx (int) and row (dict), which is expected to return a dict representing new columns for that row, keyed by the new column names.

ndx is an integer representing the index of the row. Only included if include_ndx is set to True.

row is a dictionary keyed by existing columns

method Table.add_data

add_data(*data)

Adds a new row of data to the table.

The maximum amount ofrows in a table is determined by wandb.Table.MAX_ARTIFACT_ROWS.

The length of the data should match the length of the table column.

method Table.add_row

add_row(*row)

Deprecated; use add_data instead.

method Table.cast

cast(col_name, dtype, optional=False)

Casts a column to a specific data type.

This can be one of the normal python classes, an internal W&B type, or an example object, like an instance of wandb.Image or wandb.Classes.

Args:

• col_name (str): The name of the column to cast.
• dtype (class, wandb.wandb_sdk.interface._dtypes.Type, any): The target dtype.
• optional (bool): If the column should allow Nones.

method Table.get_column

get_column(name, convert_to=None)

Retrieves a column from the table and optionally converts it to a NumPy object.

Args:

• name: (str) - the name of the column
• convert_to: (str, optional) - “numpy”: will convert the underlying data to numpy object

method Table.get_dataframe

get_dataframe()

Returns a pandas.DataFrame of the table.

method Table.get_index

get_index()

Returns an array of row indexes for use in other tables to create links.