Apply UDF in cuDF failing

Question

based on my cuDF data I want to create a new column called "Leg" :

| DateTime |Close| SMA |

| -------- | -------------- | -------- |

| 2004-10-25 01:00:00 | 87.17 | 86 |

| 2004-10-25 01:30:00 | 87.18 | 86.02 |

| 2004-10-25 02:00:00 | 87.14 | 85.99 |

| 2004-10-25 02:30:00 | 87 | 85.5 |

| 2004-10-25 03:00:00 | 87.03 | 85.55 |

def is_leg(Close, SMA, Leg):
    for i in Close :
        if i==0:
            i = i+2
        elif Close[i-2]>SMA[i-2] and Close[i-1]>SMA[i-1] and Close[i]>SMA[i]:
            Leg[i] = 1
        elif Close[i-2]<SMA[i-2] and Close[i-1]<SMA[i-1] and Close[i]<SMA[i]:
             Leg[i] = -1
        else:
            Leg[i] = 0

and trying to run it on my cuDF with :

import numpy as np
CJ_m30 = CJ_m30.apply_rows(is_leg,
                          incols = {'Close':'Close','SMA':'SMA'},
                          outcols = dict(Leg=np.float64),
                          kwargs=dict())

Gives me the error :

TypingError: Failed in cuda mode pipeline (step: nopython frontend) Failed in cuda mode pipeline (step: nopython frontend) No implementation of function Function() found for signature:

getitem(array(float64, 1d, A), float64)

Can someone explain me ? I want to create Leg column ... I'm new to Rapids environment.

Thank you