class_docstr: A subclass of :class:`~ffcv.fields.Field` supporting (scalar) floating-point (float64)
  values.
class_docstr_tok: ["A","subclass","of",":","class",":","`","~ffcv.fields.Field","`","supporting","(","scalar",")","floating-point","(","float64",")","values","."]
code: def metadata_type(self) -> np.dtype:
      return np.dtype("<f8")
  
imports: from typing import Callable, TYPE_CHECKING, Tuple, Type
  from dataclasses import replace
  import numpy
  from .base import Field, ARG_TYPE
  from ..pipeline.operation import Operation
  from ..pipeline.state import State
  from ..pipeline.allocation_query import AllocationQuery
label_desc: Use image node_id 2 for calling the FloatField obj's underlying member method code with example usage: obj.metadata_type() and returns: np