def test_calculation_file_only_one_variable(self):
rd = self.test_data.get_rd('cancm4_tas')
field = rd.get()
field = field.get_field_slice({'time': slice(0, 10)})
expr = 'es=6.1078*exp(17.08085*(tas-273.16)/(234.175+(tas-273.16)))'
ef = EvalFunction(expr=expr, field=field, file_only=True)
ret = ef.execute()
self.assertEqual(ret['es']._value, None)
def test_calculation_one_variable_exp_and_log(self):
rd = self.test_data.get_rd('cancm4_tas')
field = rd.get()
# field = field[:, 0:10, :, :, :]
field = field.get_field_slice({'time': slice(0, 10)})
expr = 'es=6.1078*exp(log(17.08085)*(tas-273.16)/(234.175+(tas-273.16)))'
ef = EvalFunction(expr=expr, field=field)
ret = ef.execute()
var = field['tas']
actual_value = 6.1078 * np.exp(
np.log(17.08085) * (var.get_value() - 273.16) /
(234.175 + (var.get_value() - 273.16)))
self.assertNumpyAll(ret['es'].get_value(), actual_value)
def test_calculation_file_only_two_variables(self):
rd = self.test_data.get_rd('cancm4_tas')
rd2 = self.test_data.get_rd('cancm4_tasmax_2001')
field = rd.get()
field2 = rd2.get()
with orphaned(field2['tasmax']):
field.add_variable(field2['tasmax'], is_data=True)
field = field.get_field_slice({'time': slice(0, 10)})
expr = 'foo=log(1000*(tasmax-tas))/3'
ef = EvalFunction(expr=expr, field=field, file_only=True)
ret = ef.execute()
self.assertEqual(ret['foo']._value, None)
def test_calculation_one_variable_exp_only(self):
rd = self.test_data.get_rd('cancm4_tas')
field = rd.get()
# field = field[:, 0:10, :, :, :]
field = field.get_field_slice({'time': slice(0, 10)})
expr = 'es=6.1078*exp(17.08085*(tas-273.16)/(234.175+(tas-273.16)))'
ef = EvalFunction(expr=expr, field=field)
ret = ef.execute()
self.assertEqual(list(ret.keys()), ['es'])
self.assertEqual(ret['es'].units, None)
self.assertEqual(ret['es'].name, 'es')
var = field['tas']
actual_value = 6.1078 * np.exp(17.08085 * (var.get_value() - 273.16) /
(234.175 + (var.get_value() - 273.16)))
self.assertNumpyAll(ret['es'].get_value(), actual_value)
def test_calculation_two_variables_exp_only(self):
rd = self.test_data.get_rd('cancm4_tas')
rd2 = self.test_data.get_rd('cancm4_tasmax_2001')
field = rd.get()
field2 = rd2.get()
with orphaned(field2['tasmax']):
field.add_variable(field2['tasmax'], is_data=True)
field = field.get_field_slice({'time': slice(0, 10)})
expr = 'foo=log(1000*(tasmax-tas))/3'
ef = EvalFunction(expr=expr, field=field)
ret = ef.execute()
self.assertEqual(list(ret.keys()), ['foo'])
tas = field['tas']
tasmax = field['tasmax']
actual_value = np.log(1000 *
(tasmax.get_value() - tas.get_value())) / 3
self.assertNumpyAll(ret['foo'].get_value(), actual_value)
def test_init(self):
expr = 'es=6.1078*exp(17.08085*(tas-273.16)/(234.175+(tas-273.16)))'
ef = EvalFunction(expr=expr)
self.assertEqual(ef.expr, expr)
def execute(self, coll, file_only=False, tgds=None):
"""
:param :class:~`ocgis.SpatialCollection` coll:
:param bool file_only:
:param dict tgds: {'field_alias': :class:`ocgis.interface.base.dimension.temporal.TemporalGroupDimension`,...}
"""
from ocgis import VariableCollection
# Select which dictionary will hold the temporal group dimensions.
if tgds is None:
tgds_to_use = self._tgds
tgds_overloaded = False
else:
tgds_to_use = tgds
tgds_overloaded = True
# Group the variables. If grouping is None, calculations are performed on each element.
if self.grouping is not None:
ocgis_lh('Setting temporal groups: {0}'.format(self.grouping),
'calc.engine')
for field in coll.iter_fields():
if tgds_overloaded:
assert field.name in tgds_to_use
else:
if field.name not in tgds_to_use:
tgds_to_use[field.name] = field.time.get_grouping(
self.grouping)
# Iterate over functions.
for ugid, container in list(coll.children.items()):
for field_name, field in list(container.children.items()):
new_temporal = tgds_to_use.get(field_name)
if new_temporal is not None:
new_temporal = new_temporal.copy()
# If the engine has a grouping, ensure it is equivalent to the new temporal dimension.
if self.grouping is not None:
try:
compare = set(new_temporal.grouping) == set(
self.grouping)
# Types may be unhashable, compare directly.
except TypeError:
compare = new_temporal.grouping == self.grouping
if not compare:
msg = 'Engine temporal grouping and field temporal grouping are not equivalent. Perhaps ' \
'optimizations are incorrect?'
ocgis_lh(logger='calc.engine', exc=ValueError(msg))
out_vc = VariableCollection()
for f in self.funcs:
try:
ocgis_lh('Calculating: {0}'.format(f['func']),
logger='calc.engine')
# Initialize the function.
function = f['ref'](
alias=f['name'],
dtype=None,
field=field,
file_only=file_only,
vc=out_vc,
parms=f['kwds'],
tgd=new_temporal,
calc_sample_size=self.calc_sample_size,
meta_attrs=f.get('meta_attrs'),
spatial_aggregation=self.spatial_aggregation)
# Allow a calculation to create a temporal aggregation after initialization.
if new_temporal is None and function.tgd is not None:
new_temporal = function.tgd.extract()
except KeyError:
# Likely an eval function which does not have the name key.
function = EvalFunction(
field=field,
file_only=file_only,
vc=out_vc,
expr=self.funcs[0]['func'],
meta_attrs=self.funcs[0].get('meta_attrs'))
ocgis_lh('calculation initialized',
logger='calc.engine',
level=logging.DEBUG)
# Return the variable collection from the calculations.
out_vc = function.execute()
for dv in out_vc.values():
# Any outgoing variables from a calculation must have an associated data type.
try:
assert dv.dtype is not None
except AssertionError:
assert isinstance(dv.dtype, np.dtype)
# If this is a file only operation, there should be no computed values.
if file_only:
assert dv._value is None
ocgis_lh('calculation finished',
logger='calc.engine',
level=logging.DEBUG)
# Try to mark progress. Okay if it is not there.
try:
self._progress.mark()
except AttributeError:
pass
out_field = function.field.copy()
function_tag = function.tag
# Format the returned field. Doing things like removing original data variables and modifying the
# time dimension if necessary. Field functions handle all field modifications on their own, so bypass
# in that case.
if new_temporal is not None:
new_temporal = new_temporal.extract()
format_return_field(function_tag,
out_field,
new_temporal=new_temporal)
# Add the calculation variables.
for variable in list(out_vc.values()):
variable = variable.extract()
out_field.add_variable(variable)
# Tag the calculation data as data variables.
out_field.append_to_tags(function_tag, list(out_vc.keys()))
# Update the field if there is a CRS. This will ensure accurate tagging of data variables.
if out_field.crs is not None:
# print 'here'
out_field.crs.format_spatial_object(out_field)
coll.children[ugid].children[field_name] = out_field
return coll