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from pydicom.dataset import Dataset
from pydicom.sequence import Sequence
from pydicom.tag import Tag
def create_nested_test_seq(num_items: int = 6280) -> Dataset:
"""Create a simplified version of sequence from issue #1728"""
# original had 6280 items, but that is probably larger than needed
from copy import deepcopy
ds = Dataset()
# Per-frame Functional Groups Sequence
func_gps_seq = Sequence()
ds.PerFrameFunctionalGroupsSequence = func_gps_seq
# Per-frame Functional Groups Sequence: Per-frame Functional Groups 1
func_gps1 = Dataset()
# Plane Position Sequence
plane_pos_seq = Sequence()
func_gps1.PlanePositionSequence = plane_pos_seq
func_gps_seq.append(func_gps1)
# Plane Position Sequence: Plane Position 1
plane_pos1 = Dataset()
plane_pos1.XOffsetInSlideCoordinateSystem = '0.0'
plane_pos1.YOffsetInSlideCoordinateSystem = '0.0'
plane_pos1.ZOffsetInSlideCoordinateSystem = '0.0'
plane_pos1.ColumnPositionInTotalImagePixelMatrix = 1
plane_pos1.RowPositionInTotalImagePixelMatrix = 1
plane_pos_seq.append(plane_pos1)
for i in range(num_items - 1):
func_gp = Dataset()
plane_pos = deepcopy(plane_pos1)
# Ensure different numbers to avoid memory caching of some kind
plane_pos.ColumnPositionInTotalImagePixelMatrix = i
plane_pos.RowPositionInTotalImagePixelMatrix = i
func_gp.PlanePositionSequence = Sequence([plane_pos])
func_gps_seq.append(func_gp)
return ds
class TimeNestedSeqAccess:
"""Time tests for large nested sequences."""
len_top_sequence = 2000
dataset = create_nested_test_seq(len_top_sequence)
def setup(self):
pass
def time_iterate_nested_elems(self):
for func_gp in self.dataset.PerFrameFunctionalGroupsSequence:
pps_item = func_gp.PlanePositionSequence[0]
(
pps_item.RowPositionInTotalImagePixelMatrix,
pps_item.ColumnPositionInTotalImagePixelMatrix,
)
def time_index_to_nested_items(self):
for i in range(len(self.dataset.PerFrameFunctionalGroupsSequence)):
func_gp = self.dataset.PerFrameFunctionalGroupsSequence[i]
pps_item = func_gp.PlanePositionSequence[0]
(
pps_item.RowPositionInTotalImagePixelMatrix,
pps_item.ColumnPositionInTotalImagePixelMatrix,
)
def time_iterate_preload_tags(self):
row_pos_tag = Tag("RowPositionInTotalImagePixelMatrix")
col_pos_tag = Tag("ColumnPositionInTotalImagePixelMatrix")
plane_pos_seq_tag = Tag("PlanePositionSequence")
for func_gp in self.dataset.PerFrameFunctionalGroupsSequence:
pps_item = func_gp[plane_pos_seq_tag][0]
(
pps_item[row_pos_tag].value,
pps_item[col_pos_tag].value,
)
def track_len_top_sequence(self):
return self.len_top_sequence
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