MindInsight throws DivisionByZero error when width is 0 in histogram info

[wenkai128]

Environment

Hardware Environment(Ascend/GPU/CPU):

Uncomment only one /device <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/device ascend
/device gpu

/device cpu

device irrelevant

Software Environment:

• MindSpore version (source or binary): 0.3.0
• Python version (e.g., Python 3.7.5): 3.7
• OS platform and distribution (e.g., Linux Ubuntu 16.04):
• GCC/Compiler version (if compiled from source):

Describe the current behavior

MindInsight throws DivisionByZero error when width is 0 in histogram info.

histogram and width is defined in https://github.com/mindspore-ai/mindspore/blob/master/mindspore/ccsrc/utils/summary.proto

Describe the expected behavior

MindInsight handles this ill formatted data correctly.

Steps to reproduce the issue

Related log / screenshot

==> restful_api/restful_api.log <==
[ERROR] MI(746:139931119613696,MainProcess):2020-06-13-10:57:54.226.516 [mindinsight/datavisual/common/error_handler.py:56][RESTFUL_API] 'GET' '/v1/mindinsight/datavisual/histograms' detail: 'float divisi
on by zero'
[ERROR] MI(746:139931119613696,MainProcess):2020-06-13-10:57:54.226.834 [mindinsight/datavisual/common/error_handler.py:57][RESTFUL_API] float division by zero
Traceback (most recent call last):
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/mindinsight/backend/datavisual/train_visual_api.py", line 161, in histogram
    response = processor.get_histograms(train_id, tag)
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/mindinsight/datavisual/processors/histogram_processor.py", line 57, in get_histograms
    buckets = histogram.buckets()
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/mindinsight/datavisual/data_transform/histogram_container.py", line 253, in buckets
    self._re_sample_buckets()
  File "/home/wenkai/anaconda3/lib/python3.7/site-packages/mindinsight/datavisual/data_transform/histogram_container.py", line 228, in _re_sample_buckets
    estimated_count = (intersection / original_bucket.width) * original_bucket.count
ZeroDivisionError: float division by zero

Special notes for this issue

[wenkai128]

test.zero.summary.1592016979.zip

file to reproduce this issue