code: def _DenseToCSRSparseMatrixGrad(op: ops.Operation, grad):
      """Gradient for dense_to_csr_sparse_matrix op."""
      grad_values = sparse_csr_matrix_ops.csr_sparse_matrix_to_dense(
          grad, type=op.get_attr("T")
      )
      # inputs to fw op were: params, indices.
      return (grad_values, None)
  
file_path: tensorflow/tensorflow/python/ops/linalg/sparse/sparse_csr_matrix_grad.py
imports: from tensorflow.python.framework import ops
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import sparse_ops
  from tensorflow.python.ops.linalg.sparse import sparse_csr_matrix_ops
label_desc: Use image node_id 1 for calling a global function with example usage: _DenseToCSRSparseMatrixGrad(op, grad) and returns: grad_values,  None