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Can I speed up a matrix * tensor calculation?

• To: mathgroup at smc.vnet.net
• Subject: [mg111303] Can I speed up a matrix * tensor calculation?
• From: Jagra <jagra24891 at mypacks.net>
• Date: Tue, 27 Jul 2010 04:15:48 -0400 (EDT)

I have a tensor and a matrix. Both pretty large.  Both have real
numbers with machine precision:

    Dimensions[matrix]
    {10000, 5000}

    Dimensions[tensor]
    {5000, 7, 10000}

I need to do the following:

    Total[matrix]* Transpose[tensor {2, 3, 1}]];

but this runs very slowly.  I've thought I needed to transpose the
tensor to multiply it properly.
The result should give me a vector of 5000 elements.

Any suggestions that can speed this up?

Thanks.

J