Add docstrings to _is_torch_array and _is_jax_array

Author: patel-zeel

lib/matplotlib/cbook.py

@@ -2235,13 +2235,15 @@ def _picklable_class_constructor(mixin_class, fmt, attr_name, base_class):
 
 
 def _is_torch_array(x):
+    """Check if 'x' is a PyTorch Tensor."""
     try:
         return isinstance(x, sys.modules['torch'].Tensor)
     except Exception as e:  # not using bare `except` to bypass flake8
         return False
 
 
 def _is_jax_array(x):
+    """Check if 'x' is a JAX Array."""
     try:
         return isinstance(x, sys.modules['jax'].Array)
     except Exception as e:  # not using bare `except` to bypass flake8