wkcn commented on issue #14610: [Feature Request] Disable lazy evaluation URL: https://github.com/apache/incubator-mxnet/issues/14610#issuecomment-479459608 I wrote a test case: ```python import mxnet as mx import time N = 4000 a = mx.nd.zeros((N, N)) b = mx.nd.zeros((N, N)) while 1: tic = time.time() c = mx.nd.dot(a, b) # time.sleep(5) tic2 = time.time() c.wait_to_read() print("wait_to_read", time.time() - tic2) print(time.time() - tic) ``` The output is as follow: ``` ('wait_to_read', 2.236266851425171) 2.23689508438 ('wait_to_read', 2.1589441299438477) 2.15961289406 ('wait_to_read', 2.1335580348968506) 2.13375878334 ``` It takes about 2 seconds to execute all operators. However, after uncommenting `time.sleep(5)`, there is the output: ``` ('wait_to_read', 6.985664367675781e-05) 5.00382494926 ('wait_to_read', 2.384185791015625e-05) 5.00761890411 ('wait_to_read', 2.5987625122070312e-05) 5.0087518692 ``` It shows that `wait_to_read` spent `2e-5` seconds. When does the operators execute?
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