def _encode_list_column(original, encoded, dtype=None):
"""Convert `encoded` to be a list column with the
same offsets as `original`
"""
if isinstance(original, pd.Series):
# Pandas version (not very efficient)
offset = 0
new_data = []
for val in original.values:
size = len(val)
new_data.append(
np.array(encoded[offset:offset + size], dtype=dtype))
offset += size
return pd.Series(new_data)
else:
# CuDF version
encoded = as_column(encoded)
if dtype:
encoded = encoded.astype(dtype, copy=False)
list_dtype = cudf.core.dtypes.ListDtype(
encoded.dtype if dtype is None else dtype)
return build_column(
None,
dtype=list_dtype,
size=original.size,
children=(original._column.offsets, encoded),
)
def _encode_list_column(original, encoded):
encoded = as_column(encoded)
return build_column(
None,
dtype=cudf.core.dtypes.ListDtype(encoded.dtype),
size=original.size,
children=(original._column.offsets, encoded),
)
def as_timedelta_column(self, dtype, **kwargs):
return build_column(
data=self.astype("int64").base_data,
dtype=dtype,
mask=self.base_mask,
offset=self.offset,
size=self.size,
)
def _build_cudf_list_column(new_elements, new_offsets):
if not HAS_GPU:
return []
return build_column(
None,
dtype=cudf.core.dtypes.ListDtype(new_elements.dtype),
size=new_offsets.size - 1,
children=(as_column(new_offsets), as_column(new_elements)),
)
def as_numerical(self):
from cudf.core.column import build_column
return build_column(
data=self.base_data,
dtype=np.int64,
mask=self.base_mask,
offset=self.offset,
size=self.size,
)
def as_datetime_column(self, dtype, **kwargs):
from cudf.core.column import build_column
return build_column(
data=self.astype("int64").base_data,
dtype=dtype,
mask=self.base_mask,
offset=self.offset,
size=self.size,
)
def as_timedelta_column(self, dtype: Dtype,
**kwargs) -> "cudf.core.column.TimeDeltaColumn":
return cast(
"cudf.core.column.TimeDeltaColumn",
build_column(
data=self.astype("int64").base_data,
dtype=dtype,
mask=self.base_mask,
offset=self.offset,
size=self.size,
),
)
def execute(self,
requests: List[InferenceRequest]) -> List[InferenceResponse]:
"""Transforms the input batches by running through a NVTabular workflow.transform
function.
"""
responses = []
for request in requests:
# create a cudf DataFrame from the triton request
input_df = cudf.DataFrame({
name: _convert_tensor(get_input_tensor_by_name(request, name))
for name in self.input_dtypes
})
for name, dtype in self.input_multihots.items():
values = as_column(
_convert_tensor(
get_input_tensor_by_name(request, name + "__values")))
nnzs = as_column(
_convert_tensor(
get_input_tensor_by_name(request, name + "__nnzs")))
input_df[name] = build_column(None,
dtype=dtype,
size=nnzs.size - 1,
children=(nnzs, values))
# use our NVTabular workflow to transform the dataframe
output_df = nvtabular.workflow._transform_partition(
input_df, [self.workflow.column_group])
# convert back to a triton response
output_tensors = []
for name in output_df.columns:
col = output_df[name]
if is_list_dtype(col.dtype):
# convert list values to match TF dataloader
values = col.list.leaves.values_host.astype(
self.output_dtypes[name + "__values"])
values = values.reshape(len(values), 1)
output_tensors.append(Tensor(name + "__values", values))
offsets = col._column.offsets.values_host.astype(
self.output_dtypes[name + "__nnzs"])
nnzs = offsets[1:] - offsets[:-1]
nnzs = nnzs.reshape(len(nnzs), 1)
output_tensors.append(Tensor(name + "__nnzs", nnzs))
else:
d = col.values_host.astype(self.output_dtypes[name])
d = d.reshape(len(d), 1)
output_tensors.append(Tensor(name, d))
responses.append(InferenceResponse(output_tensors))
return responses
def _with_type_metadata(self: ColumnBase, dtype: Dtype) -> ColumnBase:
if isinstance(dtype, CategoricalDtype):
return column.build_categorical_column(
categories=dtype.categories._values,
codes=build_column(self.base_data, dtype=self.dtype),
mask=self.base_mask,
ordered=dtype.ordered,
size=self.size,
offset=self.offset,
null_count=self.null_count,
)
return self
def _fillna_natwise(col):
# If the value we are filling is np.datetime64("NAT")
# we set the same mask as current column.
# However where there are "<NA>" in the
# columns, their corresponding locations
nat = cudf._lib.scalar._create_proxy_nat_scalar(col.dtype)
result = cudf._lib.replace.replace_nulls(col, nat)
return column.build_column(
data=result.base_data,
dtype=result.dtype,
size=result.size,
offset=result.offset,
children=result.base_children,
)
def create_multihot_col(self, offsets, data):
"""
offsets = cudf series with offset values for list data
data = cudf series with the list data flattened to 1-d
"""
offs = as_column(offsets, dtype="int32")
encoded = as_column(data)
col = build_column(
None,
size=offs.size - 1,
dtype=cudf.core.dtypes.ListDtype(encoded.dtype),
children=(offs, encoded),
)
return cudf.Series(col)
def transform(self, columns: ColumnNames,
df: DataFrameType) -> DataFrameType:
on_cpu = isinstance(df, pd.DataFrame)
ret = pd.DataFrame() if on_cpu else cudf.DataFrame()
for col in columns:
# handle CPU via normal python slicing (not very efficient)
if on_cpu:
ret[col] = [row[self.start:self.end] for row in df[col]]
else:
# figure out the size of each row from the list offsets
c = df[col]._column
offsets = c.offsets.values
elements = c.elements.values
# figure out the size of each row after slicing start/end
new_offsets = cp.zeros(offsets.size, dtype=offsets.dtype)
threads = 32
blocks = (offsets.size + threads - 1) // threads
# calculate new row offsets after slicing
_calculate_row_sizes[blocks, threads](self.start, self.end,
offsets, new_offsets)
new_offsets = cp.cumsum(new_offsets).astype(offsets.dtype)
# create a new array for the sliced elements
new_elements = cp.zeros(new_offsets[-1].item(),
dtype=elements.dtype)
if new_elements.size:
_slice_rows[blocks, threads](self.start, offsets, elements,
new_offsets, new_elements)
# build up a list column with the sliced values
ret[col] = build_column(
None,
dtype=cudf.core.dtypes.ListDtype(new_elements.dtype),
size=new_offsets.size - 1,
children=(as_column(new_offsets), as_column(new_elements)),
)
return ret
def assert_buffer_equal(buffer_and_dtype: Tuple[_CuDFBuffer, Any], cudfcol):
buf, dtype = buffer_and_dtype
device_id = cp.asarray(cudfcol.data).device.id
assert buf.__dlpack_device__() == (2, device_id)
col_from_buf = build_column(Buffer(buf.ptr, buf.bufsize),
protocol_dtype_to_cupy_dtype(dtype))
# check that non null values are the equals as nulls are represented
# by sentinel values in the buffer.
# FIXME: In gh-10202 some minimal fixes were added to unblock CI. But
# currently only non-null values are compared, null positions are
# unchecked.
non_null_idxs = ~cudf.Series(cudfcol).isna()
assert_eq(col_from_buf[non_null_idxs], cudfcol[non_null_idxs])
if dtype[0] != _DtypeKind.BOOL:
array_from_dlpack = cp.fromDlpack(buf.__dlpack__()).get()
col_array = cp.asarray(cudfcol.data_array_view).get()
assert_eq(
array_from_dlpack[non_null_idxs.to_numpy()].flatten(),
col_array[non_null_idxs.to_numpy()].flatten(),
)
else:
pytest.raises(TypeError, buf.__dlpack__)
def as_datetime_column(self, dtype, **kwargs):
from cudf.core.column import build_column
return build_column(data=self.astype("int64").data,
dtype=dtype,
mask=self.mask)
def as_numerical(self):
from cudf.core.column import build_column
return build_column(data=self.data, dtype=np.int64, mask=self.mask)
