Class MessageMeta

class MessageMeta

Container for class holding a data table, in practice a cudf DataFrame, with the ability to return both Python and C++ representations of the table.

Subclassed by morpheus::SlicedMessageMeta

Public Functions

virtual TensorIndex count() const

Get the row count of the underlying DataFrame.

Returns

TensorIndex

virtual TableInfo get_info() const

Get the info object.

Returns

TableInfo

virtual TableInfo get_info(const std::string &col_name) const

Get the info object for a specific column.

Parameters

col_name – The name of the column to slice

Returns

TableInfo The table info containing only the column specified

virtual TableInfo get_info(const std::vector<std::string> &column_names) const

Get the info object for a specific set of columns.

Parameters

column_names – The names of the columns to slice

Returns

TableInfo The table info containing only the columns specified, in the order specified

virtual void set_data(const std::string &col_name, TensorObject tensor)

Set the data for a single column from a TensorObject.

Parameters
  • col_name – The name of the column to set

  • tensor – The tensor to set the column to

virtual void set_data(const std::vector<std::string> &column_names, const std::vector<TensorObject> &tensors)

Set the data for multiple columns from a vector of TensorObjects.

Parameters
  • column_names – The names of the columns to set

  • tensors – The tensors to set the columns to

virtual MutableTableInfo get_mutable_info() const

TODO(Documentation)

std::vector<std::string> get_column_names() const

bool has_sliceable_index() const

Returns true if the underlying DataFrame’s index is unique and monotonic. Sliceable indices have better performance since a range of rows can be specified by a start and stop index instead of requiring boolean masks.

Returns

bool

virtual std::optional<std::string> ensure_sliceable_index()

Replaces the index in the underlying dataframe if the existing one is not unique and monotonic. The old index will be preserved in a column named _index_{old_index.name}. If has_sliceable_index() == true, this is a no-op.

Returns

std::string The name of the column with the old index or nullopt if no changes were made.

Public Static Functions

static std::shared_ptr<MessageMeta> create_from_python(pybind11::object &&data_table)

Create MessageMeta cpp object from a python object.

Parameters

data_table

Returns

std::shared_ptr<MessageMeta>

static std::shared_ptr<MessageMeta> create_from_cpp(cudf::io::table_with_metadata &&data_table, int index_col_count = 0)

Create MessageMeta cpp object from a cpp object, used internally by create_from_cpp

Parameters
  • data_table

  • index_col_count

Returns

std::shared_ptr<MessageMeta>

Protected Functions

MessageMeta(std::shared_ptr<IDataTable> data)

Protected Attributes

std::shared_ptr<IDataTable> m_data

Protected Static Functions

static pybind11::object cpp_to_py(cudf::io::table_with_metadata &&table, int index_col_count = 0)

Create MessageMeta python object from a cpp object.

Parameters
  • table

  • index_col_count

Returns

pybind11::object

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