Added option for z_truth to be inside an hdf5 group (#94)

* I added the option for z_truth to be inside an hdf5 group

* Fixing bug

* Testing hdf5_groupname with ifs

* add hdf5_groupname to override shared_params in test

* added pragma statement

* I changed the default goupname to empty string "". With this modification it is not necessary to change the test

---------

Co-authored-by: sschmidt23 <sschmidt@physics.ucdavis.edu>
Co-authored-by: Eric Charles <badass@stanford.edu>

src/rail/evaluation/evaluator.py

@@ -25,6 +25,7 @@ class Evaluator(RailStage):
                           nzbins=Param(int, 301, msg="# of bins in zgrid"),
                           pit_metrics=Param(str, 'all', msg='PIT-based metrics to include'),
                           point_metrics=Param(str, 'all', msg='Point-estimate metrics to include'),
+                          hdf5_groupname=Param(str, '', msg='Name of group in hdf5 where redshift data is located'),
                           do_cde=Param(bool, True, msg='Evaluate CDE Metric'),
                           redshift_col=SHARED_PARAMS)
     inputs = [('input', QPHandle),
@@ -79,7 +80,12 @@ def run(self):
         """
 
         pz_data = self.get_data('input')
-        z_true = self.get_data('truth')[self.config.redshift_col]
+        if self.config.hdf5_groupname:  # pragma: no cover
+            specz_data = self.get_data('truth')[self.config.hdf5_groupname]
+        else: 
+            specz_data = self.get_data('truth')
+        z_true = specz_data[self.config['redshift_col']]
+
         zgrid = np.linspace(self.config.zmin, self.config.zmax, self.config.nzbins+1)
 
         # Create an instance of the PIT class