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Modules

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Files

file  reshape.hpp
 Column APIs for interleave and tile.
 

Enumerations

enum  cudf::flip_endianness : bool { NO, YES }
 Configures whether byte casting flips endianness.
 

Functions

std::unique_ptr< columncudf::interleave_columns (table_view const &input, rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
 Interleave columns of a table into a single column. More...
 
std::unique_ptr< tablecudf::tile (table_view const &input, size_type count, rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
 Repeats the rows from input table count times to form a new table. More...
 
std::unique_ptr< columncudf::byte_cast (column_view const &input_column, flip_endianness endian_configuration, rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
 Converts a column's elements to lists of bytes. More...
 

Detailed Description

Function Documentation

◆ byte_cast()

std::unique_ptr<column> cudf::byte_cast ( column_view const &  input_column,
flip_endianness  endian_configuration,
rmm::mr::device_memory_resource mr = rmm::mr::get_current_device_resource() 
)

Converts a column's elements to lists of bytes.

input<int32> = [8675, 309]
configuration = flip_endianness::YES
return = [[0x00, 0x00, 0x21, 0xe3], [0x00, 0x00, 0x01, 0x35]]
Parameters
input_columnColumn to be converted to lists of bytes.
endian_configurationWhether to retain or flip the endianness of the elements.
mrDevice memory resource used to allocate the returned column's device memory.
Returns
The column containing the lists of bytes.

◆ interleave_columns()

std::unique_ptr<column> cudf::interleave_columns ( table_view const &  input,
rmm::mr::device_memory_resource mr = rmm::mr::get_current_device_resource() 
)

Interleave columns of a table into a single column.

Converts the column major table input into a row major column. Example:

in = [[A1, A2, A3], [B1, B2, B3]]
return = [A1, B1, A2, B2, A3, B3]
Exceptions
cudf::logic_errorif input contains no columns.
cudf::logic_errorif input columns dtypes are not identical.
Parameters
[in]inputTable containing columns to interleave.
Returns
The interleaved columns as a single column

◆ tile()

std::unique_ptr<table> cudf::tile ( table_view const &  input,
size_type  count,
rmm::mr::device_memory_resource mr = rmm::mr::get_current_device_resource() 
)

Repeats the rows from input table count times to form a new table.

output.num_columns() == input.num_columns() output.num_rows() == input.num_rows() * count

input = [[8, 4, 7], [5, 2, 3]]
count = 2
return = [[8, 4, 7, 8, 4, 7], [5, 2, 3, 5, 2, 3]]
Parameters
[in]inputTable containing rows to be repeated.
[in]countNumber of times to tile "rows". Must be non-negative.
Returns
The table containing the tiled "rows".