code: def is_valid_einsum_char(x: str) -> bool:
      """Check if the character ``x`` is valid for numpy einsum. **Examples:**
  
      ```python
      is_valid_einsum_char("a")
      #> True
  
      is_valid_einsum_char("Ǵ")
      #> False
      ```
      """
      return (x in _einsum_symbols_base) or (x in ",->.")
  
file_path: ivy/ivy/utils/einsum_parser.py
imports: import itertools
  from typing import Any, Dict, Iterator, List, Tuple, Union
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: is_valid_einsum_char(x) and returns: unknown