Modularize spaceToBatchND.

[annxingyuan]

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This change is 

[lina128]

Reviewable status: 0 of 1 approvals obtained (waiting on @annxingyuan, @lina128, and @tafsiri)

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tfjs-core/src/ops/space_to_batch_nd.ts, line 108 at r1 (raw file):

  const forward: ForwardFunc<T> = backend => {
    return backend.spaceToBatchND($x, blockShape, paddings);
  };

nit: backend => backend.spaceToBatchND($x, blockShape, paddings);

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tfjs-core/src/public/chained_ops/space_to_batch_nd.ts, line 21 at r1 (raw file):

import {Rank} from '../../types';

declare module '../../tensor' {

Also remove from tensor.ts?

[annxingyuan]

Reviewable status: 0 of 1 approvals obtained (waiting on @lina128 and @tafsiri)

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tfjs-core/src/ops/space_to_batch_nd.ts, line 108 at r1 (raw file):

Previously, lina128 (Na Li) wrote…

nit: backend => backend.spaceToBatchND($x, blockShape, paddings);

Done

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tfjs-core/src/public/chained_ops/space_to_batch_nd.ts, line 21 at r1 (raw file):

Previously, lina128 (Na Li) wrote…

Also remove from tensor.ts?

Done

[lina128]

LGTM

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @lina128 and @tafsiri)