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Reduce backward memory to ~half #218

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Reduce backward memory to ~half #218

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Commits on Dec 10, 2021

  1. various inplace ops on the CPU 

    - reuse y_act_ and dy_act_
- use inplace calculations in `forward_cpu` and `backward_cpu`
    @jasam-sheja
    jasam-sheja committed Dec 10, 2021
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  2. reuse y_act_ and dy_act_ in inplace_ab_cuda.cu

    @jasam-sheja
    jasam-sheja committed Dec 10, 2021
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  3. modify Activation::ELU::backward to allow inplace

    @jasam-sheja
    jasam-sheja committed Dec 10, 2021
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  4. python side compatibility 

    - make sure dy_act doesn't have memory overlaping
- reflect the inplace operations in the doc and comments
    @jasam-sheja
    jasam-sheja committed Dec 10, 2021
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