Set default value of evaluation_cost to 0 in BaseMetric class #1263
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Addresses #1262 The evaluate() method of GEval derived from BaseMetric was raising a TypeError: unsupported operand type(s) for +=: 'NoneType' and 'int/float' when called directly (without a prior call to measure()). This was due to the evaluation_cost attribute being initialized to None in the BaseMetric class.
self.evaluation_cost += cost
This throws an error as evaluation_cost is None by default in BaseMetric class and cost is a float.This PR initializes evaluation_cost to 0 in the BaseMetric attributes, preventing the TypeError and allowing evaluate() to be called directly without issues.