deephaven.learn

• gather
  • MemoryLayout
    • MemoryLayout.C
    • MemoryLayout.COLUMN_MAJOR
    • MemoryLayout.FORTRAN
    • MemoryLayout.ROW_MAJOR
  • table_to_numpy_2d()

Deephaven’s learn module provides utilities for efficient data transfer between Deephaven tables and Python objects, as well as a framework for using popular machine-learning / deep-learning libraries with Deephaven tables.

class Input(col_names, gather_func)

Bases: object

Input specifies how to gather data from a Deephaven table into an object.

class Output(col_name, scatter_func, col_type)

Bases: object

Output specifies how to scatter data from an object into a table column.

learn(table=None, model_func=None, inputs=[], outputs=[], batch_size=None)

Learn gathers data from multiple rows of the input table, performs a calculation, and scatters values from the calculation into an output table. This is a common computing paradigm for artificial intelligence, machine learning, and deep learning.

Parameters:

• table (Table) – the Deephaven table to perform computations on.

• model_func (Callable) – function that performs computations on the table.

• inputs (List[Input]) – list of Input objects that determine how data gets extracted from the table.

• outputs (List[Output]) – list of Output objects that determine how data gets scattered back into the results table.

• batch_size (int) – maximum number of rows for which model_func is evaluated at once.

Return type:

Table

Returns:

a Table with added columns containing the results of evaluating model_func.

Raises:

DHError –