34 lines
966 B
Python
34 lines
966 B
Python
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# if: (if(smth) else)
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# switch: (if(smth) elif(smth))
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from theano import tensor as T
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from theano.ifelse import ifelse
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import theano, time, numpy
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a,b = T.scalars('a', 'b')
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x,y = T.matrices('x', 'y')
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z_switch = T.switch(T.lt(a, b), T.mean(x), T.mean(y))
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z_lazy = ifelse(T.lt(a, b), T.mean(x), T.mean(y))
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f_switch = theano.function([a, b, x, y], z_switch,
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mode=theano.Mode(linker='vm'))
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f_lazyifelse = theano.function([a, b, x, y], z_lazy,
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mode=theano.Mode(linker='vm'))
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val1 = 0.
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val2 = 1.
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big_mat1 = numpy.ones((10000, 1000))
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big_mat2 = numpy.ones((10000, 1000))
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n_times = 10
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tic = time.clock()
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for i in range(n_times):
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f_switch(val1, val2, big_mat1, big_mat2)
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print('time spent evaluating both values %f sec' % (time.clock() - tic))
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tic = time.clock()
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for i in range(n_times):
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f_lazyifelse(val1, val2, big_mat1, big_mat2)
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print('time spent evaluating one value %f sec' % (time.clock() - tic))
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