def _distribution_test(stochastic_event_set_data, observation_data):
# for cached files want to write this with memmap
union_catalog = flat_map_to_ndarray(stochastic_event_set_data)
min_time = 0.0
max_time = numpy.max([
numpy.max(numpy.ceil(union_catalog)),
numpy.max(numpy.ceil(observation_data))
])
# build test_distribution with 100 data points
num_points = 100
tms = numpy.linspace(min_time, max_time, num_points, endpoint=True)
# get combined ecdf and obs ecdf
combined_ecdf = binned_ecdf(union_catalog, tms)
obs_ecdf = binned_ecdf(observation_data, tms)
# build test distribution
n_cat = len(stochastic_event_set_data)
test_distribution = []
for i in range(n_cat):
test_ecdf = binned_ecdf(stochastic_event_set_data[i], tms)
# indicates there were zero events in catalog
if test_ecdf is not None:
d = sup_dist(test_ecdf[1], combined_ecdf[1])
test_distribution.append(d)
d_obs = sup_dist(obs_ecdf[1], combined_ecdf[1])
# score evaluation
_, quantile = get_quantiles(test_distribution, d_obs)
return test_distribution, d_obs, quantile
def number_test(forecast, observed_catalog):
""" Performs the number test on a catalog-based forecast.
The number test builds an empirical distribution of the event counts for each data. By default, this
function does not perform any filtering on the catalogs in the forecast or observation. These should be handled
outside of the function.
Args:
forecast (:class:`csep.core.forecasts.CatalogForecast`): forecast to evaluate
observed_catalog (:class:`csep.core.catalogs.AbstractBaseCatalog`): evaluation data
Returns:
evaluation result (:class:`csep.models.EvaluationResult`): evaluation result
"""
event_counts = []
for catalog in forecast:
event_counts.append(catalog.event_count)
obs_count = observed_catalog.event_count
delta_1, delta_2 = get_quantiles(event_counts, obs_count)
# prepare result
result = CatalogNumberTestResult(test_distribution=event_counts,
name='Catalog N-Test',
observed_statistic=obs_count,
quantile=(delta_1, delta_2),
status='Normal',
obs_catalog_repr=str(observed_catalog),
sim_name=forecast.name,
min_mw=forecast.min_magnitude,
obs_name=observed_catalog.name)
return result
def magnitude_test(forecast, observed_catalog):
""" Performs magnitude test for catalog-based forecasts """
test_distribution = []
if forecast.region.magnitudes is None:
raise CSEPEvaluationException("Forecast must have region.magnitudes member to perform magnitude test.")
# short-circuit if zero events
if observed_catalog.event_count == 0:
print("Cannot perform magnitude test when observed event count is zero.")
return None
# compute expected rates for forecast if needed
if forecast.expected_rates is None:
forecast.get_expected_rates()
# returns the average events in the magnitude bins
union_histogram = forecast.expected_rates.magnitude_counts()
n_union_events = numpy.sum(union_histogram)
obs_histogram = observed_catalog.magnitude_counts()
n_obs = numpy.sum(obs_histogram)
union_scale = n_obs / n_union_events
scaled_union_histogram = union_histogram * union_scale
# compute the test statistic for each catalog
for catalog in forecast:
mag_counts = catalog.magnitude_counts()
n_events = numpy.sum(mag_counts)
if n_events == 0:
# print("Skipping to next because catalog contained zero events.")
continue
scale = n_obs / n_events
catalog_histogram = mag_counts * scale
# compute magnitude test statistic for the catalog
test_distribution.append(
cumulative_square_diff(numpy.log10(catalog_histogram + 1), numpy.log10(scaled_union_histogram + 1))
)
# compute observed statistic
obs_d_statistic = cumulative_square_diff(numpy.log10(obs_histogram + 1), numpy.log10(scaled_union_histogram + 1))
# score evaluation
delta_1, delta_2 = get_quantiles(test_distribution, obs_d_statistic)
# prepare result
result = CatalogMagnitudeTestResult(test_distribution=test_distribution,
name='M-Test',
observed_statistic=obs_d_statistic,
quantile=(delta_1, delta_2),
status='Normal',
min_mw=forecast.min_magnitude,
obs_catalog_repr=str(observed_catalog),
obs_name=observed_catalog.name,
sim_name=forecast.name)
return result
def number_test(forecast, observed_catalog, verbose=True):
""" Performs the number test on a catalog-based forecast.
The number test builds an empirical distribution of the event counts for each data. By default, this
function does not perform any filtering on the catalogs in the forecast or observation. These should be handled
outside of the function.
Args:
forecast (:class:`csep.core.forecasts.CatalogForecast`): forecast to evaluate
observed_catalog (:class:`csep.core.catalogs.AbstractBaseCatalog`): evaluation data
Returns:
evaluation result (:class:`csep.models.EvaluationResult`): evaluation result
"""
event_counts = []
t0 = time.time()
for i, catalog in enumerate(forecast):
# output status
if verbose:
tens_exp = numpy.floor(numpy.log10(i + 1))
if (i + 1) % 10**tens_exp == 0:
t1 = time.time()
print(f'Processed {i + 1} catalogs in {t1 - t0} seconds',
flush=True)
event_counts.append(catalog.event_count)
obs_count = observed_catalog.event_count
delta_1, delta_2 = get_quantiles(event_counts, obs_count)
# prepare result
result = CatalogNumberTestResult(test_distribution=event_counts,
name='Catalog N-Test',
observed_statistic=obs_count,
quantile=(delta_1, delta_2),
status='normal',
obs_catalog_repr=str(observed_catalog),
sim_name=forecast.name,
min_mw=forecast.min_magnitude,
obs_name=observed_catalog.name)
return result
def spatial_test(forecast, observed_catalog, verbose=True):
""" Performs spatial test for catalog-based forecasts.
Args:
forecast: CatalogForecast
observed_catalog: CSEPCatalog filtered to be consistent with the forecast
Returns:
CatalogSpatialTestResult
"""
if forecast.region is None:
raise CSEPEvaluationException(
"Forecast must have region member to perform spatial test.")
# get observed likelihood
if observed_catalog.event_count == 0:
print(
f'Spatial test not-invalid because no events in observed catalog.')
test_distribution = []
# compute expected rates for forecast if needed
if forecast.expected_rates is None:
forecast.get_expected_rates(verbose=verbose)
expected_cond_count = forecast.expected_rates.sum()
forecast_mean_spatial_rates = forecast.expected_rates.spatial_counts()
# summing over spatial counts ensures that the correct number of events are used; even through the catalogs should
# be filtered before calling this function
gridded_obs = observed_catalog.spatial_counts()
n_obs = numpy.sum(gridded_obs)
# iterate through catalogs in forecast and compute likelihood
t0 = time.time()
for i, catalog in enumerate(forecast):
gridded_cat = catalog.spatial_counts()
_, lh_norm = _compute_likelihood(gridded_cat,
forecast_mean_spatial_rates,
expected_cond_count, n_obs)
test_distribution.append(lh_norm)
# output status
if verbose:
tens_exp = numpy.floor(numpy.log10(i + 1))
if (i + 1) % 10**tens_exp == 0:
t1 = time.time()
print(f'Processed {i + 1} catalogs in {t1 - t0} seconds',
flush=True)
_, obs_lh_norm = _compute_likelihood(gridded_obs,
forecast_mean_spatial_rates,
expected_cond_count, n_obs)
# if obs_lh is -numpy.inf, recompute but only for indexes where obs and simulated are non-zero
message = "normal"
if obs_lh_norm == -numpy.inf:
idx_good_sim = forecast_mean_spatial_rates != 0
new_gridded_obs = gridded_obs[idx_good_sim]
new_n_obs = numpy.sum(new_gridded_obs)
print(
f"Found -inf as the observed likelihood score. "
f"Assuming event(s) occurred in undersampled region of forecast.\n"
f"Recomputing with {new_n_obs} events after removing {n_obs - new_n_obs} events."
)
new_ard = forecast_mean_spatial_rates[idx_good_sim]
_, obs_lh_norm = _compute_likelihood(new_gridded_obs, new_ard,
expected_cond_count, n_obs)
message = "undersampled"
# check for nans here and remove from spatial distribution
test_distribution_spatial_1d = numpy.array(test_distribution)
if numpy.isnan(numpy.sum(test_distribution_spatial_1d)):
test_distribution_spatial_1d = test_distribution_spatial_1d[
~numpy.isnan(test_distribution_spatial_1d)]
if n_obs == 0 or numpy.isnan(obs_lh_norm):
message = "not-valid"
delta_1, delta_2 = -1, -1
else:
delta_1, delta_2 = get_quantiles(test_distribution_spatial_1d,
obs_lh_norm)
result = CatalogSpatialTestResult(
test_distribution=test_distribution_spatial_1d,
name='S-Test',
observed_statistic=obs_lh_norm,
quantile=(delta_1, delta_2),
status=message,
min_mw=forecast.min_magnitude,
obs_catalog_repr=str(observed_catalog),
sim_name=forecast.name,
obs_name=observed_catalog.name)
return result
def pseudolikelihood_test(forecast, observed_catalog, verbose=True):
""" Performs the spatial pseudolikelihood test for catalog forecasts.
Performs the spatial pseudolikelihood test as described by Savran et al., 2020. The tests uses a pseudolikelihood
statistic computed from the expected rates in spatial cells. A pseudolikelihood test based on space-magnitude bins
is in a development mode and does not exist currently.
Args:
forecast: :class:`csep.core.forecasts.CatalogForecast`
observed_catalog: :class:`csep.core.catalogs.AbstractBaseCatalog`
"""
if forecast.region is None:
raise CSEPEvaluationException(
"Forecast must have region member to perform spatial test.")
# get observed likelihood
if observed_catalog.event_count == 0:
print(
f'Skipping pseudolikelihood test because no events in observed catalog.'
)
return None
test_distribution = []
# compute expected rates for forecast if needed
if forecast.expected_rates is None:
_ = forecast.get_expected_rates(verbose=verbose)
expected_cond_count = forecast.expected_rates.sum()
forecast_mean_spatial_rates = forecast.expected_rates.spatial_counts()
# summing over spatial counts ensures that the correct number of events are used; even through the catalogs should
# be filtered before calling this function
gridded_obs = observed_catalog.spatial_counts()
n_obs = numpy.sum(gridded_obs)
t0 = time.time()
for i, catalog in enumerate(forecast):
gridded_cat = catalog.spatial_counts()
plh, _ = _compute_likelihood(gridded_cat, forecast_mean_spatial_rates,
expected_cond_count, n_obs)
test_distribution.append(plh)
# output status
if verbose:
tens_exp = numpy.floor(numpy.log10(i + 1))
if (i + 1) % 10**tens_exp == 0:
t1 = time.time()
print(f'Processed {i + 1} catalogs in {t1 - t0} seconds',
flush=True)
obs_plh, _ = _compute_likelihood(gridded_obs, forecast_mean_spatial_rates,
expected_cond_count, n_obs)
# if obs_lh is -numpy.inf, recompute but only for indexes where obs and simulated are non-zero
message = "normal"
if obs_plh == -numpy.inf:
idx_good_sim = forecast_mean_spatial_rates != 0
new_gridded_obs = gridded_obs[idx_good_sim]
new_n_obs = numpy.sum(new_gridded_obs)
print(
f"Found -inf as the observed likelihood score. "
f"Assuming event(s) occurred in undersampled region of forecast.\n"
f"Recomputing with {new_n_obs} events after removing {n_obs - new_n_obs} events."
)
if new_n_obs == 0:
print(
f'Skipping pseudo-likelihood based tests for because no events in observed catalog '
f'after correcting for under-sampling in forecast.')
return None
new_ard = forecast_mean_spatial_rates[idx_good_sim]
# we need to use the old n_obs here, because if we normalize the ard to a different value the observed
# statistic will not be computed correctly.
obs_plh, _ = _compute_likelihood(new_gridded_obs, new_ard,
expected_cond_count, n_obs)
message = "undersampled"
# check for nans here
test_distribution_1d = numpy.array(test_distribution)
if numpy.isnan(numpy.sum(test_distribution_1d)):
test_distribution_1d = test_distribution_1d[
~numpy.isnan(test_distribution_1d)]
if n_obs == 0 or numpy.isnan(obs_plh):
message = "not-valid"
delta_1, delta_2 = -1, -1
else:
delta_1, delta_2 = get_quantiles(test_distribution_1d, obs_plh)
# prepare evaluation result
result = CatalogPseudolikelihoodTestResult(
test_distribution=test_distribution_1d,
name='PL-Test',
observed_statistic=obs_plh,
quantile=(delta_1, delta_2),
status=message,
min_mw=forecast.min_magnitude,
obs_catalog_repr=str(observed_catalog),
sim_name=forecast.name,
obs_name=observed_catalog.name)
return result
