code: def _check_precisions_full(precisions, covariance_type):
      """Check the precision matrices are symmetric and positive-definite."""
      for k, prec in enumerate(precisions):
          prec = _check_precision_matrix(prec, covariance_type)
  
imports: import numpy
  from scipy import linalg
  from .base import BaseMixture, _check_shape
  from ..externals.six.moves import zip
  from ..utils import check_array
  from ..utils.validation import check_is_fitted
  from ..utils.extmath import row_norms
label_desc: Use image node_id 5 for calling a global function with example usage: _check_precisions_full(precisions, covariance_type) without return types