Move imports to the top of the file

metadetect/lsst/measure.py

@@ -27,7 +27,7 @@
 from ..fitting import fit_mbobs_wavg, get_wavg_output_struct
 
 from . import util
-from .util import ContextNoiseReplacer
+from .util import ContextNoiseReplacer, get_jacobian
 from . import vis
 from .defaults import DEFAULT_THRESH
 
@@ -657,7 +657,6 @@ def _extract_jacobian_at_source(exp, source):
     Jacobian: ngmix.Jacobian
         The local jacobian
     """
-    from .util import get_jacobian
 
     orig_cen = exp.getWcs().skyToPixel(source.getCoord())
 

metadetect/lsst/metadetect.py

@@ -608,7 +608,6 @@ def fit_original_psfs_mbexp(mbexp, rng, wgts):
 
     This can fail and flags will be set, but we proceed
     """
-    from .measure import extract_psf_image
 
     assert len(wgts) == len(mbexp)
     wsum = sum(wgts)
@@ -634,7 +633,7 @@ def fit_original_psfs_mbexp(mbexp, rng, wgts):
             )
             jac = get_jacobian(exp=exp, cen=cen)
 
-            psf_im = extract_psf_image(exp, cen)
+            psf_im = measure.extract_psf_image(exp, cen)
 
             psf_cen = (np.array(psf_im.shape)-1.0)/2.0
             psf_jacob = jac.copy()

metadetect/lsst/skysub.py

@@ -6,8 +6,8 @@
 )
 from lsst.meas.algorithms import SourceDetectionConfig as OriginalSourceDetectionConfig
 from lsst.pex.config import Config, ConfigurableField, Field
-from lsst.pipe.base import Task
-
+from lsst.pex.exceptions import RuntimeError as LSSTRuntimeError
+from lsst.pipe.base import Task, TaskError
 
 from .defaults import DEFAULT_THRESH
 from . import util
@@ -64,8 +64,6 @@ def __init__(self, *args, **kwargs):
         self.makeSubtask("back")
 
     def run(self, exposure):
-        from lsst.pex.exceptions import RuntimeError as LSSTRuntimeError
-        from lsst.pipe.base.task import TaskError
         if self.config.niter < 1:
             raise ValueError(f'niter {self.config.niter} is less than 1')