code: def dtype(*, x=None, dtype=None, fallback_tf_dtype=False):
      for dtype, tf_dtype in DTYPE_MAPPING.items():
          if x.dtype == tf_dtype:
              return dtype
      else:
          if fallback_tf_dtype:
              return x.dtype
          raise TensorforceError.value(
              name="tf_util.dtype", argument="x.dtype", value=x.dtype
          )
  
file_path: tensorforce/tensorforce/core/utils/tf_util.py
imports: import tensorflow
  from tensorforce import TensorforceError
label_desc: Use image node_id 3 for calling a global function with example usage: dtype() and returns: dtype, x