Path: news.mathworks.com!not-for-mail
From: "zaheer ahmad" <ahmad.zaheer@yah00000.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re-Training net with different input size matrix( different sizes of input layer)
Date: Fri, 12 Dec 2008 14:10:06 +0000 (UTC)
Organization: IMS
Lines: 7
Message-ID: <ghtrbu$5dq$1@fred.mathworks.com>
Reply-To: "zaheer ahmad" <ahmad.zaheer@yah00000.com>
NNTP-Posting-Host: webapp-02-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1229091006 5562 172.30.248.37 (12 Dec 2008 14:10:06 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Fri, 12 Dec 2008 14:10:06 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 706613
Xref: news.mathworks.com comp.soft-sys.matlab:506567


Is it possible in Matlab to retrain a trained net with different input sized matrix( different sizes of  input layers )? if yes then  how to train the network using different input sized matrix i.e. i want to first train the network on 21x15 input matrix then want to train ( re-train ) the same network on 16x10 input matrix. The purpose of the process is to get a network which will be able to recognize different size of characters( to better generalize).....
I tried directly to pass new input matrix to 'train' but it produced error ( as i was expecting ).
one technique might be to pass it the weights and bias returned from the first training session but there will be a mismatch in the number of weights and bias because of change in number of input in input layer.... and i just got why the function 'train' trained on input size-1 matrix cant be trained directly on size-2 input matix....its because of number of weights too...am i correct?....then what can i do...how to retrain a network on differently sized input matrices...
I have read in some research papers people retraining net but i am not sure is it possible in matlab? 
bye the way i am working on Urdu OCR ( Optical Character Recognition ), Urdu is national language of Pakistan.
thanks in advance
zaheer ahmad