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Set default values of constants in white_noise_block #226

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Set default values of constants in white_noise_block #226

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10c4f1f
blocks.py: set default values of constants in white_noise_block
mattpitkin Mar 5, 2024
70f9434
blocks.py: uncomment accidentaly commented line
mattpitkin Mar 5, 2024
b270495
Update blocks.py
mattpitkin Mar 26, 2025
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42 changes: 35 additions & 7 deletions enterprise_extensions/blocks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,10 @@ def channelized_backends(backend_flags):


def white_noise_block(vary=False, inc_ecorr=False, gp_ecorr=False,
efac1=False, select='backend', tnequad=False, name=None, ng_twg_setup=False, wb_efac_sigma=0.25):
efac1=False, select='backend', tnequad=False,
name=None, ng_twg_setup=False, wb_efac_sigma=0.25,
init_const_efac=None, init_const_equad=None,
init_const_ecorr=None):
"""
Returns the white noise block of the model:

Expand All @@ -46,9 +49,10 @@ def white_noise_block(vary=False, inc_ecorr=False, gp_ecorr=False,
3. ECORR per backend/receiver system

:param vary:
If set to true we vary these parameters
with uniform priors. Otherwise they are set to constants
with values to be set later.
If set to true we vary these parameters with uniform priors. Otherwise they
are set to constants with values to be set later, or via the
``init_const_efac``, ``init_const_equad``, and ``init_const_ecorr``
keyword arguments.
:param inc_ecorr:
include ECORR, needed for NANOGrav channelized TOAs
:param gp_ecorr:
Expand All @@ -58,6 +62,18 @@ def white_noise_block(vary=False, inc_ecorr=False, gp_ecorr=False,
:param tnequad:
Whether to use the TempoNest definition of EQUAD. Defaults to False to
follow Tempo, Tempo2 and Pint definition.
:param init_const_efac:
If ``vary`` is false, use this to set the constant value for EFAC,
otherwise the constant value will be uninitialised and must be set
later.
:param init_const_equad:
If ``vary`` is false, use this to set the constant value for EQAUD,
otherwise the constant value will be uninitialised and must be set
later.
:param init_const_ecorr:
If ``vary`` is false, and ``inc_corr`` is true, use this to set the
constant value for EQAUD, otherwise the constant value will be
uninitialised and must be set later.
"""

if select == 'backend':
Expand All @@ -82,10 +98,22 @@ def white_noise_block(vary=False, inc_ecorr=False, gp_ecorr=False,
if inc_ecorr:
ecorr = parameter.Uniform(-8.5, -5)
else:
efac = parameter.Constant()
equad = parameter.Constant()
efac = (
parameter.Constant()
if init_const_efac is None
else parameter.Constant(init_const_efac)
)
equad = (
parameter.Constant()
if init_const_equad is None
else parameter.Constant(init_const_equad)
)
if inc_ecorr:
ecorr = parameter.Constant()
ecorr = (
parameter.Constant()
if init_const_ecorr is None
else parameter.Constant(init_const_ecorr)
)

# white noise signals
if tnequad:
Expand Down
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