ANTs interface should expose the --float parameter

[gerddie]

ANTs provides the option --float to run a registration with single floating point accuracy for computations, but this option is not exposed by the nipype interfaces. It would be nice if it did.

[satra]

@gerddie - could you please send in a PR? this should be an easy one :)

[oesteban]

Is this part of #1100 ?

[blakedewey]

No. This is an enhancement to the interface's input spec by allowing computations done as floats (not the default double). As far as I know, this option has been around in ANTs for some time and should not have a backwards compatibility issue. A PR was submitted for this #1024, but never merged. I think it is currently waiting to see if we should specify a Bool or Int trait (I vote bool personally), but they might be waiting for @hjmjohnson to weigh in or it might just have fallen to the side.

[satra]

@gerddie - any chance of merging the PR with current master and updating with the bool option. we have used --float to indicate such computation for a while now with ants.

[hjmjohnson]

There was an obscure ITK bug that only reared it's head under the convoluted use by ANTs. This has been very recently fixed and incorporated into ANTs (2015-07-05).

Usually it did not present, but depending on the data being registered, and the downsampling choose it could have occurred.

I'm in need of this feature in nipype along with the new save/load state flags. I also have a PR in place that may need to be merged with this PR

[hjmjohnson]

See Also See #1004 .

Perhaps a completely new interface with all these new changes should be created.

antsRegistration_20150710() <-- That looks ugly enough to uniquely identify the intended version of ants :)

I could easily make a new ants tag for 2.2.0 that matches nipype.

antsRegistration --version
NOTE: ./antsRegistration --version
ANTs Version: 2.1.0.post286-g9d5ee
Compiled: Jul 3 2015 17:42:17

[gerddie]

Hi, I've updated my branch by pulling in the changes from master.

[mgxd]

@gerddie @hjmjohnson is this all set?

[gerddie]

Because of moving away from the job where I actually needed this, I haven't had another look ,,,

[oesteban]

I think --float is currently working ok with ants 2.1.0