On Wed, 18 Feb 2015, Holger Hoefling wrote:
Hi Luke,
Ah - I see - thank you! This at least points me to a way on how to
"fix" this. I tried setting the srcref attribute to NULL, but the hash
value is still different and so is the serialization. So this looks
like it is one difference, but not all of them
when source attributes are attached they are attached to calls within
the body as well, so
> attributes(body(testfun))
$srcref
$srcref[[1]]
...
Even if all differences were identified - it still leaves me with
different behavior between interactive and batch-mode, though. I am
curious as to why that is. Do you know why in interactive mode the
attribute with the srcref is set, but not in batch mode?
I can't speak to why the default for the keep.source option is
different in the two cases, but you can set it to be the same: in
interactive mode
> options(keep.source = FALSE)
> testfun <- function() {return(NULL)}
> digest(testfun)
[1] "b03160b9250f0d5b5bcce42bd86d8e56"
Or use options(keep.source = TRUE) in the other case.
Best,
luke
Thanks!
Holger
P.S. I attached the output I get when i set the attributes to NULL
On Wed, Feb 18, 2015 at 3:04 PM, <luke-tier...@uiowa.edu> wrote:
Add
attributes(testfun)
and you will see where the two functions differ.
luke
On Wed, 18 Feb 2015, Holger Hoefling wrote:
Hi,
I posted this question to the regular help list, but it seems to be
this is probably a question that is better addressed on r-devel. Sorry
for the double posting.
I am using hash-values to cache certain results in R. This caching
also depends on the hash-value of the function that is being cached
(calculated using the digest package). I noticed that computations
that should already be cached are recomputed when switching from an
interactive session to a BATCH session. Therefore, I wrote a test
script
library(digest)
testfun <- function() {
return(NULL)
}
testval <- "testval"
print(digest(testfun))
print(serialize(testfun, connection = NULL))
and executed it once using input-redirection from a file (testFile.R)
and once copying the code into an interactive R session. The
hash-values of the functions differ. As digest internally relies on
serialize, I also checked there and found that digest is not the
reason for the discrepancy. Instead, the serialized value of the
function already differs between the BATCH and inteactive sessions.
I was wondering if someone knows if
1. Is this a feature or a bug? It feels like a bug to me as all the
inputs are identical, I would expect that the output is identical as
well. Is there something I am overlooking?
2. Is there a way to get consistent hash-values for functions between
BATCH and interactive sessions.
The output from the BATCH and interactive runs are below (as well as
sessionInfo)
Thank you very much for your help!
Holger Hoefling
---------------------------------
BATCH run (via input redirection):
$ R --vanilla < testFile.R
R version 3.1.0 (2014-04-10) -- "Spring Dance"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-unknown-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
library(digest)
testfun <- function() {
+ return(NULL)
+ }
print(digest(testfun))
[1] "b03160b9250f0d5b5bcce42bd86d8e56"
print(serialize(testfun, connection = NULL))
[1] 58 0a 00 00 00 02 00 03 01 00 00 02 03 00 00 00 04 03 00 00 00 fd 00
00 00
[26] fe 00 00 00 06 00 00 00 01 00 04 00 09 00 00 00 01 7b 00 00 00 02 00
00 00
[51] 06 00 00 00 01 00 04 00 09 00 00 00 06 72 65 74 75 72 6e 00 00 00 02
00 00
[76] 00 fe 00 00 00 fe 00 00 00 fe
sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] digest_0.6.4
----------------------------------------------
Interactive run:
$ R --vanilla
R version 3.1.0 (2014-04-10) -- "Spring Dance"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-unknown-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
library(digest)
testfun <- function() {
+ return(NULL)
+ }
print(digest(testfun))
[1] "fada482d2894088b079a8e56b7044862"
print(serialize(testfun, connection = NULL))
[1] 58 0a 00 00 00 02 00 03 01 00 00 02 03 00 00 00 06 03 00 00 04 02 00
00 00
[26] 01 00 04 00 09 00 00 00 06 73 72 63 72 65 66 00 00 03 0d 00 00 00 08
00 00
[51] 00 01 00 00 00 0c 00 00 00 03 00 00 00 01 00 00 00 0c 00 00 00 01 00
00 00
[76] 01 00 00 00 03 00 00 04 02 00 00 00 01 00 04 00 09 00 00 00 07 73 72
63 66
[101] 69 6c 65 00 00 00 04 00 00 00 00 00 00 00 f2 00 00 04 02 00 00 00 01
00 04
[126] 00 09 00 00 00 05 6c 69 6e 65 73 00 00 00 10 00 00 00 01 00 04 00 09
00 00
[151] 00 2b 74 65 73 74 66 75 6e 20 3c 2d 20 66 75 6e 63 74 69 6f 6e 28 29
20 7b
[176] 0a 20 20 20 20 72 65 74 75 72 6e 28 4e 55 4c 4c 29 0a 7d 0a 00 00 04
02 00
[201] 00 00 01 00 04 00 09 00 00 00 08 66 69 6c 65 6e 61 6d 65 00 00 00 10
00 00
[226] 00 01 00 04 00 09 00 00 00 00 00 00 00 fe 00 00 00 fe 00 00 04 02 00
00 00
[251] 01 00 04 00 09 00 00 00 05 63 6c 61 73 73 00 00 00 10 00 00 00 02 00
04 00
[276] 09 00 00 00 0b 73 72 63 66 69 6c 65 63 6f 70 79 00 04 00 09 00 00 00
07 73
[301] 72 63 66 69 6c 65 00 00 00 fe 00 00 04 02 00 00 06 ff 00 00 00 10 00
00 00
[326] 01 00 04 00 09 00 00 00 06 73 72 63 72 65 66 00 00 00 fe 00 00 00 fe
00 00
[351] 00 fd 00 00 00 fe 00 00 02 06 00 00 04 02 00 00 01 ff 00 00 00 13 00
00 00
[376] 02 00 00 03 0d 00 00 00 08 00 00 00 01 00 00 00 17 00 00 00 01 00 00
00 17
[401] 00 00 00 17 00 00 00 17 00 00 00 01 00 00 00 01 00 00 04 02 00 00 02
ff 00
[426] 00 03 ff 00 00 04 02 00 00 06 ff 00 00 00 10 00 00 00 01 00 04 00 09
00 00
[451] 00 06 73 72 63 72 65 66 00 00 00 fe 00 00 03 0d 00 00 00 08 00 00 00
02 00
[476] 00 00 05 00 00 00 02 00 00 00 10 00 00 00 05 00 00 00 10 00 00 00 02
00 00
[501] 00 02 00 00 04 02 00 00 02 ff 00 00 03 ff 00 00 04 02 00 00 06 ff 00
00 00
[526] 10 00 00 00 01 00 04 00 09 00 00 00 06 73 72 63 72 65 66 00 00 00 fe
00 00
[551] 04 02 00 00 02 ff 00 00 03 ff 00 00 04 02 00 00 00 01 00 04 00 09 00
00 00
[576] 0b 77 68 6f 6c 65 53 72 63 72 65 66 00 00 03 0d 00 00 00 08 00 00 00
01 00
[601] 00 00 00 00 00 00 03 00 00 00 01 00 00 00 00 00 00 00 01 00 00 00 01
00 00
[626] 00 03 00 00 04 02 00 00 02 ff 00 00 03 ff 00 00 04 02 00 00 06 ff 00
00 00
[651] 10 00 00 00 01 00 04 00 09 00 00 00 06 73 72 63 72 65 66 00 00 00 fe
00 00
[676] 00 fe 00 00 00 01 00 04 00 09 00 00 00 01 7b 00 00 00 02 00 00 00 06
00 00
[701] 00 01 00 04 00 09 00 00 00 06 72 65 74 75 72 6e 00 00 00 02 00 00 00
fe 00
[726] 00 00 fe 00 00 00 fe
sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] digest_0.6.4
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
