Mark test_batchnorm_with_type as flaky (#19492)
Mark test_batchnorm_with_type as flaky (#19492)

[2020-11-06T21:37:09.831Z]       # V2, 1D
[2020-11-06T21:37:09.831Z]       for fix_gamma, cudnn_off in itertools.product(bools, bools):
[2020-11-06T21:37:09.831Z]           sym = mx.sym.BatchNorm(name='norm', fix_gamma=fix_gamma, cudnn_off=cudnn_off)
[2020-11-06T21:37:09.831Z] >         check_consistency(sym, ctx_list_v2_1D)
[...]
[2020-11-06T21:37:09.831Z] E       AssertionError: 
[2020-11-06T21:37:09.831Z] E       Items are not equal:
[2020-11-06T21:37:09.831Z] E       Error 8317.657381 exceeds tolerance rtol=1.000000e-05, atol=1.000000e-20 (mismatch 50.000000%).
[2020-11-06T21:37:09.831Z] E       Location of maximum error: (0,), a=-0.00000000, b=-0.00000000
[2020-11-06T21:37:09.831Z] E        ACTUAL: array([ -0.        , -39.62720511])
[2020-11-06T21:37:09.831Z] E        DESIRED: array([ -0.        , -39.62720511])
tlby/mxnet,leezu/mxnet,tlby/mxnet,tlby/mxnet,leezu/mxnet,szha/mxnet,leezu/mxnet,szha/mxnet,szha/mxnet,leezu/mxnet,tlby/mxnet,tlby/mxnet,tlby/mxnet,szha/mxnet,apache/incubator-mxnet,leezu/mxnet,DickJC123/mxnet,szha/mxnet,apache/incubator-mxnet,tlby/mxnet,leezu/mxnet,leezu/mxnet,apache/incubator-mxnet,tlby/mxnet,szha/mxnet,szha/mxnet,tlby/mxnet,leezu/mxnet,szha/mxnet,DickJC123/mxnet,DickJC123/mxnet,DickJC123/mxnet,leezu/mxnet,apache/incubator-mxnet,szha/mxnet,tlby/mxnet