[TOPI] Make cumsum IR reusable, add thrust scan#7303

Merged

masahi merged 15 commits intoapache:mainfrom masahi:cuda-ex-scan

Jan 20, 2021

+666-194

Commits on Jan 20, 2021

import changes from scan branch

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fix for 1d scan

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rename

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cast to out dtype

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do not run return reduction for inclusive scan

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remove another ceil_div definition

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adding scan test
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add scheduling for scan op, fixed scan 1d test
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pylint fix
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add doc string

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add more thrust scan test

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add dynamic get valid count test, including empty size tensor
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fix hard coded gpu targets for cpu only env
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try retunring early if scan_size is 0
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another change for empty tensor and thrust path
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