support negative split value

[pyu10055]

the numOfSplit param can have -1 value, which indicate the rest of the dimension.
https://www.tensorflow.org/api_docs/python/tf/raw_ops/SplitV

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This change is 

[lina128]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @lina128 and @pyu10055)

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tfjs-converter/src/operations/executors/slice_join_executor.ts, line 135 at r1 (raw file):

      if (Array.isArray(numOrSizeSplits)) {
        if (numOrSizeSplits[numOrSizeSplits.length - 1] === -1) {
          const total = numOrSizeSplits.reduce((a, b) => b > 0 ? a + b : a);

nit: From the code, this indicates that any element can be < 0, is that true? If not, can we simply reduce((a, b) => a + b)?

[pyu10055]

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

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tfjs-converter/src/operations/executors/slice_join_executor.ts, line 135 at r1 (raw file):

Previously, lina128 (Na Li) wrote…

nit: From the code, this indicates that any element can be < 0, is that true? If not, can we simply reduce((a, b) => a + b)?

Thanks, I updated the logic, the neg value can be anywhere in the array, but there should be just one.