Modularize depthwise conv ops.

[lina128]

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This change is 

[tafsiri]

LGTM.

Reviewed 13 of 13 files at r1.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @annxingyuan, @jinjingforever, @lina128, and @tafsiri)

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tfjs-core/src/ops/depthwise_conv2d_native_backprop_filter.ts, line 29 at r1 (raw file):

function depthwiseConv2dNativeBackpropFilter_<T extends Tensor3D|Tensor4D>(
    x: T, dy: T, filterShape: [number, number, number, number],
    strides: [number, number]|number, pad: 'valid'|'same'|number,

+1. Good change.

[jinjingforever]

Thanks Na! LGTM

Reviewable status: complete! 2 of 1 approvals obtained (waiting on @annxingyuan, @jinjingforever, and @lina128)

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tfjs-backend-cpu/src/register_all_kernels.ts, line 138 at r1 (raw file):

  cosConfig,
  coshConfig,
  depthwiseConv2dNativeConfig,

nit: order

[lina128]

Reviewable status: complete! 2 of 1 approvals obtained (waiting on @annxingyuan and @tafsiri)

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tfjs-backend-cpu/src/register_all_kernels.ts, line 138 at r1 (raw file):

Previously, jinjingforever (Jing Jin) wrote…

nit: order

Done.

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tfjs-core/src/ops/depthwise_conv2d_native_backprop_filter.ts, line 29 at r1 (raw file):

Previously, tafsiri (Yannick Assogba) wrote…

+1. Good change.

Ack.