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"""Tests (un)packing (from)to buffers."""
import numpy as np
from pystencils import Field, FieldType, Assignment, create_kernel
from pystencils.field import layout_string_to_tuple, create_numpy_array_with_layout
from pystencils.stencil import direction_string_to_offset
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from pystencils.slicing import add_ghost_layers, get_slice_before_ghost_layer, get_ghost_region_slice
FIELD_SIZES = [(32, 10), (10, 8, 6)]
def _generate_fields(dt=np.uint64, num_directions=1, layout='numpy'):
field_sizes = FIELD_SIZES
if num_directions > 1:
field_sizes = [s + (num_directions,) for s in field_sizes]
fields = []
for size in field_sizes:
field_layout = layout_string_to_tuple(layout, len(size))
src_arr = create_numpy_array_with_layout(size, field_layout)
array_data = np.reshape(np.arange(1, int(np.prod(size)+1)), size)
# Use flat iterator to input data into the array
src_arr.flat = add_ghost_layers(array_data, index_dimensions=1 if num_directions > 1 else 0).astype(dt).flat
dst_arr = np.zeros(src_arr.shape, dtype=dt)
buffer_arr = np.zeros(np.prod(src_arr.shape), dtype=dt)
fields.append((src_arr, dst_arr, buffer_arr))
return fields
def test_full_scalar_field():
"""Tests fully (un)packing a scalar field (from)to a buffer."""
fields = _generate_fields()
for (src_arr, dst_arr, buffer_arr) in fields:
src_field = Field.create_from_numpy_array("src_field", src_arr)
dst_field = Field.create_from_numpy_array("dst_field", dst_arr)
buffer = Field.create_generic("buffer", spatial_dimensions=1,
field_type=FieldType.BUFFER, dtype=src_arr.dtype)
pack_eqs = [Assignment(buffer.center(), src_field.center())]
pack_code = create_kernel(pack_eqs, data_type={'src_field': src_arr.dtype, 'buffer': buffer.dtype})
pack_kernel = pack_code.compile()
pack_kernel(buffer=buffer_arr, src_field=src_arr)
unpack_eqs = [Assignment(dst_field.center(), buffer.center())]
unpack_code = create_kernel(unpack_eqs, data_type={'dst_field': dst_arr.dtype, 'buffer': buffer.dtype})
unpack_kernel = unpack_code.compile()
unpack_kernel(dst_field=dst_arr, buffer=buffer_arr)
np.testing.assert_equal(src_arr, dst_arr)
def test_field_slice():
"""Tests (un)packing slices of a scalar field (from)to a buffer."""
fields = _generate_fields()
for d in ['N', 'S', 'NW', 'SW', 'TNW', 'B']:
for (src_arr, dst_arr, bufferArr) in fields:
# Extract slice from N direction of the field
slice_dir = direction_string_to_offset(d, dim=len(src_arr.shape))
pack_slice = get_slice_before_ghost_layer(slice_dir)
unpack_slice = get_ghost_region_slice(slice_dir)
src_field = Field.create_from_numpy_array("src_field", src_arr[pack_slice])
dst_field = Field.create_from_numpy_array("dst_field", dst_arr[unpack_slice])
buffer = Field.create_generic("buffer", spatial_dimensions=1,
field_type=FieldType.BUFFER, dtype=src_arr.dtype)
pack_eqs = [Assignment(buffer.center(), src_field.center())]
pack_code = create_kernel(pack_eqs, data_type={'src_field': src_arr.dtype, 'buffer': buffer.dtype})
pack_kernel = pack_code.compile()
pack_kernel(buffer=bufferArr, src_field=src_arr[pack_slice])
# Unpack into ghost layer of dst_field in N direction
unpack_eqs = [Assignment(dst_field.center(), buffer.center())]
unpack_code = create_kernel(unpack_eqs, data_type={'dst_field': dst_arr.dtype, 'buffer': buffer.dtype})
unpack_kernel = unpack_code.compile()
unpack_kernel(buffer=bufferArr, dst_field=dst_arr[unpack_slice])
np.testing.assert_equal(src_arr[pack_slice], dst_arr[unpack_slice])
def test_all_cell_values():
"""Tests (un)packing all cell values of the a field (from)to a buffer."""
num_cell_values = 19
fields = _generate_fields(num_directions=num_cell_values)
for (src_arr, dst_arr, bufferArr) in fields:
src_field = Field.create_from_numpy_array("src_field", src_arr, index_dimensions=1)
dst_field = Field.create_from_numpy_array("dst_field", dst_arr, index_dimensions=1)
buffer = Field.create_generic("buffer", spatial_dimensions=1, index_dimensions=1,
field_type=FieldType.BUFFER, dtype=src_arr.dtype)
pack_eqs = []
# Since we are packing all cell values for all cells, then
# the buffer index is equivalent to the field index
for idx in range(num_cell_values):
eq = Assignment(buffer(idx), src_field(idx))
pack_eqs.append(eq)
pack_code = create_kernel(pack_eqs, data_type={'src_field': src_arr.dtype, 'buffer': buffer.dtype})
pack_kernel = pack_code.compile()
pack_kernel(buffer=bufferArr, src_field=src_arr)
unpack_eqs = []
for idx in range(num_cell_values):
eq = Assignment(dst_field(idx), buffer(idx))
unpack_eqs.append(eq)
unpack_code = create_kernel(unpack_eqs, data_type={'dst_field': dst_arr.dtype, 'buffer': buffer.dtype})
unpack_kernel = unpack_code.compile()
unpack_kernel(buffer=bufferArr, dst_field=dst_arr)
np.testing.assert_equal(src_arr, dst_arr)
def test_subset_cell_values():
"""Tests (un)packing a subset of cell values of the a field (from)to a buffer."""
num_cell_values = 19
# Cell indices of the field to be (un)packed (from)to the buffer
cell_indices = [1, 5, 7, 8, 10, 12, 13]
fields = _generate_fields(num_directions=num_cell_values)
for (src_arr, dst_arr, bufferArr) in fields:
src_field = Field.create_from_numpy_array("src_field", src_arr, index_dimensions=1)
dst_field = Field.create_from_numpy_array("dst_field", dst_arr, index_dimensions=1)
buffer = Field.create_generic("buffer", spatial_dimensions=1, index_dimensions=1,
field_type=FieldType.BUFFER, dtype=src_arr.dtype)
pack_eqs = []
# Since we are packing all cell values for all cells, then
# the buffer index is equivalent to the field index
for buffer_idx, cell_idx in enumerate(cell_indices):
eq = Assignment(buffer(buffer_idx), src_field(cell_idx))
pack_eqs.append(eq)
pack_code = create_kernel(pack_eqs, data_type={'src_field': src_arr.dtype, 'buffer': buffer.dtype})
pack_kernel = pack_code.compile()
pack_kernel(buffer=bufferArr, src_field=src_arr)
unpack_eqs = []
for buffer_idx, cell_idx in enumerate(cell_indices):
eq = Assignment(dst_field(cell_idx), buffer(buffer_idx))
unpack_eqs.append(eq)
unpack_code = create_kernel(unpack_eqs, data_type={'dst_field': dst_arr.dtype, 'buffer': buffer.dtype})
unpack_kernel = unpack_code.compile()
unpack_kernel(buffer=bufferArr, dst_field=dst_arr)
mask_arr = np.ma.masked_where((src_arr - dst_arr) != 0, src_arr)
np.testing.assert_equal(dst_arr, mask_arr.filled(int(0)))
def test_field_layouts():
num_cell_values = 27
for layout_str in ['numpy', 'fzyx', 'zyxf', 'reverse_numpy']:
fields = _generate_fields(num_directions=num_cell_values, layout=layout_str)
for (src_arr, dst_arr, bufferArr) in fields:
src_field = Field.create_from_numpy_array("src_field", src_arr, index_dimensions=1)
dst_field = Field.create_from_numpy_array("dst_field", dst_arr, index_dimensions=1)
buffer = Field.create_generic("buffer", spatial_dimensions=1, index_dimensions=1,
field_type=FieldType.BUFFER, dtype=src_arr.dtype)
pack_eqs = []
# Since we are packing all cell values for all cells, then
# the buffer index is equivalent to the field index
for idx in range(num_cell_values):
eq = Assignment(buffer(idx), src_field(idx))
pack_eqs.append(eq)
pack_code = create_kernel(pack_eqs, data_type={'src_field': src_arr.dtype, 'buffer': buffer.dtype})
pack_kernel = pack_code.compile()
pack_kernel(buffer=bufferArr, src_field=src_arr)
unpack_eqs = []
for idx in range(num_cell_values):
eq = Assignment(dst_field(idx), buffer(idx))
unpack_eqs.append(eq)
unpack_code = create_kernel(unpack_eqs, data_type={'dst_field': dst_arr.dtype, 'buffer': buffer.dtype})
unpack_kernel = unpack_code.compile()
unpack_kernel(buffer=bufferArr, dst_field=dst_arr)