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1 | function x = ndlogsumexp(x,dim)
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2 | % NDLOGSUMEXP Sum over multiple dimensions in the log domain.
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3 | % ndlogsumexp(X,DIM) sums out the dimensions in DIM (using logsumexp),
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4 | % and squeezes the result.
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5 |
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6 | % Written by Tom Minka
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7 | % (c) Microsoft Corporation. All rights reserved.
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8 |
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9 | sz = size(x);
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10 | for i=1:length(dim)
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11 | x = logsumexp(x, dim(i));
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12 | end
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13 | nbig = prod(sz);
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14 | nsmall = prod(size(x));
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15 | addflops((nbig-nsmall)*(1+flops_exp) + nsmall*flops_log);
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16 | %x = mysqueeze(x);
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17 | sz(dim) = [];
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18 | x = reshape(x,[sz 1 1]);
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