Theano掃描在127步後奇怪地行爲

Question

我對Theano掃描工作方式感到困惑。我希望下面的函數單調增加，但這種情況不會發生：

import theano 
import theano.tensor as tt 
i = 500 
x, _ = theano.scan(fn=lambda previous_count: previous_count+1, outputs_info=0, n_steps=i) 
f = theano.function(inputs=[], outputs=x) 
f() 

輸出：

array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 
    12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 
    23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 
    34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 
    45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 
    56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 
    67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 
    78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 
    89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 
    100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 
    111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 
    122, 123, 124, 125, 126, 127, -128, -127, -126, -125, -124, 
    -123, -122, -121, -120, -119, -118, -117, -116, -115, -114, -113, 

...], dtype=int8) 

Answer 1

嗯，我啞...的類型設置爲int8！