code: def _is_valid_glyph(g):
      is_09 = 48 <= g["uni"] <= 57
      is_capital_az = 65 <= g["uni"] <= 90
      is_az = 97 <= g["uni"] <= 122
      is_valid_dims = g["width"] != 0 and g["vwidth"] != 0
      return (is_09 or is_capital_az or is_az) and is_valid_dims
  
imports: from absl import app
  from absl import flags
  import apache_beam
  from magenta.models.svg_vae import svg_utils
  import numpy
  from tensor2tensor.data_generators import generator_utils
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: _is_valid_glyph(g) and returns: unknown