mindnlp.core.ops.finfo增加对mindspore.bfloat16的支持

[qhzhuang]

当前不支持获取bfloat16的浮点数信息, 会报错
Traceback (most recent call last):
File "/home/opsdev/zqh/1836_full.py", line 88, in
inference(args)
File "/home/opsdev/zqh/1836_full.py", line 67, in inference
outputs = model.generate(
File "/root/miniconda3/envs/ci3.9/lib/python3.9/contextlib.py", line 79, in inner
return func(*args, **kwds)
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/transformers/generation/utils.py", line 2025, in generate
result = self._sample(
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/transformers/generation/utils.py", line 3038, in _sample
outputs = self(**model_inputs, return_dict=True)
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/core/nn/modules/module.py", line 390, in _wrapped_call_impl
return self.forward(*args, **kwargs)
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/transformers/models/qwen2/modeling_qwen2.py", line 765, in forward
outputs = self.model(
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/core/nn/modules/module.py", line 390, in _wrapped_call_impl
return self.forward(*args, **kwargs)
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/transformers/models/qwen2/modeling_qwen2.py", line 565, in forward
causal_mask = self._update_causal_mask(
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/transformers/models/qwen2/modeling_qwen2.py", line 663, in _update_causal_mask
min_dtype = float(ops.finfo(dtype).min)
File "/home/opsdev/.local/lib/python3.9/site-packages/mindnlp/core/ops/other.py", line 669, in finfo
return np.finfo(mindspore.dtype_to_nptype(dtype))
File "/home/opsdev/.local/lib/python3.9/site-packages/numpy/core/getlimits.py", line 398, in new
raise ValueError("data type %r not inexact" % (dtype))
ValueError: data type <class 'bfloat16'> not inexact