Fix gpu scalar issues

[orausch]

Now that dace has been updated to handle scalars differently, we can fix #20 and #21.

[codecov[bot]]

Codecov Report

Merging #38 (235e867) into master (dee594e) will decrease coverage by 7.78%. The diff coverage is 93.23%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   94.44%   86.66%   -7.78%     
==========================================
  Files          22       32      +10     
  Lines        1584     2497     +913     
==========================================
+ Hits         1496     2164     +668     
- Misses         88      333     +245     

Impacted Files	Coverage Δ
daceml/onnx/schema.py	94.44% <ø> (ø)
daceml/util/utils.py	84.85% <68.75%> (-15.15%)	:arrow_down:
daceml/transformation/constant_folding.py	89.04% <71.43%> (-6.86%)	:arrow_down:
daceml/autodiff/implementations/onnx_ops.py	81.25% <81.25%> (ø)
...ml/onnx/op_implementations/pure_implementations.py	83.54% <87.27%> (+0.08%)	:arrow_up:
daceml/autodiff/pytorch.py	94.12% <94.12%> (ø)
daceml/autodiff/backward_pass_generator.py	95.49% <95.49%> (ø)
daceml/autodiff/utils.py	96.97% <96.97%> (ø)
daceml/autodiff/base_abc.py	97.14% <97.14%> (ø)
daceml/autodiff/implementations/dace_nodes.py	97.56% <97.56%> (ø)
... and 26 more

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[orausch]

Fixed in #42