Howdy,
are you using the same user for the learning process and for the 
spamassassin(1) call ?
could you send me the output of `sa-learn -D all --ham <msg.eml` ?
 Thanks
  Giovanni

On 2/28/26 8:59 PM, David Birnbaum wrote:
Howdy.

I am testing this out to see how it goes.  Early results show it marking a lot 
of things as Spam that I don’t expect to see…I did notice this as I was 
training it up:

Feb 28 13:18:07.029 [169364] dbg: config: read file 
/etc/mail/spamassassin/*Neu*ralNetwork.pre

Feb 28 13:18:07.030 [169364] dbg: config: read file 
/etc/mail/spamassassin/*Neu*ralNetwork.cf

Feb 28 13:18:07.031 [169364] dbg: config: parsing file 
/etc/mail/spamassassin/*Neu*ralNetwork.pre

Feb 28 13:18:07.031 [169364] dbg: config: fixed relative path: 
/etc/mail/spamassassin/*Neu*ralNetwork.pm

Feb 28 13:18:07.031 [169364] dbg: plugin: loading 
Mail::SpamAssassin::Plugin::*Neu*ralNetwork from 
/etc/mail/spamassassin/*Neu*ralNetwork.pm

Feb 28 13:18:07.817 [169364] dbg: config: parsing file 
/etc/mail/spamassassin/*Neu*ralNetwork.cf

Feb 28 13:18:07.974 [169364] dbg: plugin: 
Mail::SpamAssassin::Plugin::*Neu*ralNetwork=HASH(0x55631d0005a0) implements 
'finish_parsing_end', priority 0

Feb 28 13:18:07.991 [169364] dbg: *Neu*ralNetwork: SQL connection initialized 
for vocabulary storage

Feb 28 13:18:10.212 [169364] dbg: *Neu*ralNetwork: Loaded 748 vocabulary terms 
from SQL for user: spam

Feb 28 13:18:10.212 [169364] dbg: *Neu*ralNetwork: Insufficient spam/ham data 
for prediction: *spam=158, ham=0*

Feb 28 13:18:10.212 [169364] dbg: *Neu*ralNetwork: Not enough tokens found

Feb 28 13:18:10.289 [169364] dbg: plugin: 
Mail::SpamAssassin::Plugin::*Neu*ralNetwork=HASH(0x55631d0005a0) implements 
'autolearn', priority 0

Feb 28 13:18:10.293 [169364] dbg: plugin: 
Mail::SpamAssassin::Plugin::*Neu*ralNetwork=HASH(0x55631d0005a0) implements 
'learn_message', priority 0

Feb 28 13:18:10.293 [169364] dbg: *Neu*ralNetwork: autolearning disabled, 
quitting


Even though I am feeding ham in, it doesn’t seem to be tagging anything as ham 
(or, at least, the counter is not being set correctly).  I have fed stuff in 
via sa-learn —ham, as well as through the normal auto-learning process (which I 
have set to 1).

I didn’t see any way to get the spam/ham token counts after this message 
disappears.  Perhaps that could be added to sa-learn —dump magic (or add 
another option there).

Any thoughts as to whether or not this is properly loading ham in correctly?  I 
downloaded it from GitHub today (2/28) so I should have the latest code 
installed.

Cheers,

David.

——

On Feb 24, 2026, at 7:59 PM, Kent Oyer <[email protected]> wrote:

I haven't had time to play with this plugin, but my understanding of this type 
of NN is that it doesn't work well with incremental training. Meaning that if 
just one item is added to the training set, the whole learning process needs to 
be re-run. Otherwise the model adjusts it's weights to match the new sample at 
the expense of all previous samples. I'm just wondering if you've run into this 
and if you have any preliminary accuracy statistics from this plugin.



On Tue, Dec 30, 2025 at 03:33 AM, Giovanni Bechis <[email protected]> wrote:

    
------------------------------------------------------------------------------------------------------------------
    CAUTION: External email from: gbechis@‌apache.‌org
    Use caution before clicking on links or opening attachments.
    
------------------------------------------------------------------------------------------------------------------
    Hi,
    I've just committed to my Github repo the first version of a SpamAssassin 
plugin that uses Neural Networks to detect spam messages.
    Code is available at https://github.com/bigio/spamassassin-NeuralNetwork 
<https://github.com/bigio/spamassassin-NeuralNetwork> , if the community is 
interested I can work on merging it to the Apache SpamAssassin src tree.
    Testers are always welcome.
    Cheers
    Giovanni
-- Giovanni Bechis
    V.P. Apache SpamAssassin
    [email protected] <mailto:[email protected]>



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