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ift
NIFTy
Commits
d8571144
Commit
d8571144
authored
May 25, 2020
by
Philipp Arras
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Turn Changelog into an actual Markdown document
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d8571144
Changes since NIFTy 5:
Changes since NIFTy 6
=====================
*None.*
Changes since NIFTy 5
=====================
Minimum Python version increased to 3.6
=======================================
---------------------------------------
New operators
=============
-------------
In addition to the below changes, the following operators were introduced:
...
...
@@ -20,14 +27,14 @@ In addition to the below changes, the following operators were introduced:
*
IntegrationOperator: Integrates over subspaces of fields
FFT convention adjusted
=======================
-----------------------
When going to harmonic space, NIFTy's FFT operator now uses a minus sign in the
exponent (and, consequently, a plus sign on the adjoint transform). This
convention is consistent with almost all other numerical FFT libraries.
Interface change in EndomorphicOperator.draw_sample()
=====================================================
-----------------------------------------------------
Both complex-valued and real-valued Gaussian probability distributions have
Hermitian and positive endomorphisms as covariance. Just by looking at an
...
...
@@ -59,13 +66,13 @@ print(met.draw_sample())
```
MPI parallelisation over samples in MetricGaussianKL
====================================================
----------------------------------------------------
The classes
`MetricGaussianKL`
and
`MetricGaussianKL_MPI`
have been unified
into one
`MetricGaussianKL`
class which has MPI support built in.
New approach for random number generation
=========================================
-----------------------------------------
The code now uses
`numpy`
's new
`SeedSequence`
and
`Generator`
classes for the
production of random numbers (introduced in numpy 1.17. This greatly simplifies
...
...
@@ -74,14 +81,14 @@ and leads to cleaner code overall. Please see the documentation of
`nifty7.random`
for details.
Interface Change for from_random and OuterProduct
=================================================
-------------------------------------------------
The sugar.from_random, Field.from_random, MultiField.from_random now take domain
as the first argument and default to 'normal' for the second argument.
Likewise OuterProduct takes domain as the first argument and a field as the second.
Interface Change for non-linear Operators
=========================================
-----------------------------------------
The method
`Operator.apply()`
takes a
`Linearization`
or a
`Field`
or a
`MultiField`
as input. This has not changed. However, now each non-linear
...
...
@@ -98,7 +105,7 @@ behaviour since both `Operator._check_input()` and
fulfilled.
Special functions for complete Field reduction operations
=========================================================
---------------------------------------------------------
So far, reduction operations called on Fields (like
`vdot`
,
`sum`
,
`integrate`
,
`mean`
,
`var`
,
`std`
,
`prod`
etc.) returned a scalar when the reduction was
...
...
@@ -110,7 +117,7 @@ operate over all subdomains and therefore don't take a `spaces` argument; they
are named
`s_vdot`
,
`s_sum`
etc. and always return a scalar.
Updates regarding correlated fields
===================================
-----------------------------------
The most commonly used model for homogeneous and isotropic correlated fields in
nifty5 has been
`SLAmplitude`
combined with
`CorrelatedField`
. This model
...
...
@@ -127,7 +134,7 @@ via `napprox` breaks the inference scheme with the new model so `napprox` may no
be used here.
Removal of the standard MPI parallelization scheme:
===================================================
---------------------------------------------------
When several MPI tasks are present, NIFTy5 distributes every Field over these
tasks by splitting it along the first axis. This approach to parallelism is not
...
...
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